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Net Deferred Tax Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Schedule of Deferred Income Tax Assets and Liabilities    
Property and equipment $ 1,751.7 $ 1,754.6
Other 1,188.8 907.0
Deferred Tax Liabilities, Gross 2,940.5 2,661.6
Property and equipment (472.7) (394.4)
Employee benefit plans (390.1) (400.3)
Intangible assets (222.6) (252.2)
Deferred foreign tax credits (289.2) (272.9)
Operating loss carryforwards (419.8) (286.5)
Other (297.0) (331.2)
Total deferred tax assets before valuation allowance (2,091.4) (1,937.5)
Valuation allowance 322.4 287.9
Deferred Tax Liabilities, Net 1,171.5 1,012.0
Balance sheet presentation: [Abstract]    
Deferred income taxes 1,704.3 1,624.5
Other noncurrent assets    
Balance sheet presentation: [Abstract]    
Deferred tax assets (532.8) (591.2)
Prepaid expenses and other current assets    
Balance sheet presentation: [Abstract]    
Deferred tax assets $ 0.0 $ (21.3)