v2.4.0.6
Retirement Benefits (Schedule of Components in Consolidated Balance Sheets) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accrued retirement benefit   $ 3,068.5 $ 1,887.4
Pension Plans, Defined Benefit [Member]
      
Defined Benefit Plan, Current Assets   160.8 58.5
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities   (57.5) (54.7)
Accrued retirement benefit   2,108.2 1,135.8
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax   4,914.8 3,852.7
Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total   2,909.9 2,720.7
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax 285.3 (200.4)  
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost, before Tax 3.3 (8.6)  
Other Postretirement Benefit Plans, Defined Benefit [Member]
      
Defined Benefit Plan, Current Assets   0 0
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities   (9.3) (9.2)
Accrued retirement benefit   960.3 751.6
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax   1,152.3 974.2
Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total   182.7 213.4
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax 95.7 (88.7)  
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost, before Tax $ 35.1 $ 42.9