Retirement Benefits (Schedule of Components in Consolidated Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	$ 2,562.9	$ 1,549.4
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost, before Tax	(34.0)	(31.9)
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Amortization of Net Gains (Losses)	(387.4)
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	211.2	881.2
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	(62.3)	(62.8)
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	2,325.6	1,313.1
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	5,158.4	3,597.0
Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total	2,981.7	3,102.3
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax	(282.3)
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost, before Tax	(3.6)
Other Postretirement Benefit Plans, Defined Benefit [Member]
Change in Retiree Health Plan - Impact on Unrecognized Prior Service Cost	520.8
Defined Benefit Plan, Amortization of Net Gains (Losses)	(37.9)
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	609.4	366.4
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	(6.9)	(7.7)
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	237.3	236.3
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	(227.2)	6.6
Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total	138.0	129.0
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax	(20.7)
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost, before Tax	$ 37.6

The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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Amount before tax, after reclassification adjustments, of actuarial gain (loss) that has not been recognized in the income statement.

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The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

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The amount of increase or decrease in the accumulated benefit obligation related to the effects of a change in the substantive terms of an existing defined benefit pension plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered.

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Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans.

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For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

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This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

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