v2.4.0.6
Net Deferred Tax Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Property and equipment $ 1,651.3 $ 1,655.2
Other 541.7 489.8
Total deferred tax liabilities 2,193.0 2,145.0
Property and equipment (355.4) (352.4)
Employee benefit plans (406.3) (356.4)
Intangible assets (256.2) (268.6)
Deferred foreign tax credits (173.9) (310.7)
Capital loss carryforwards (26.0) (37.5)
Operating loss carryforwards (71.1) (56.8)
Indemnification liabilities (33.4) (36.5)
Other (312.6) (284.0)
Total deferred tax assets before valuation allowance (1,634.9) (1,702.9)
Valuation Allowance 102.0 104.7
Net deferred tax liabilities 660.1 546.8
Balance sheet presentation:    
Deferred income taxes 1,344.1 1,332.4
Net deferred tax liabilities 660.1 546.8
Other Noncurrent Assets
   
Balance sheet presentation:    
Deferred tax assets (606.3) (590.4)
Prepaid expenses and other current assets
   
Balance sheet presentation:    
Deferred tax assets $ (77.7) $ (195.2)