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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Net taxes payable	$ 49.4us-gaap_AccruedIncomeTaxes
Net taxes recoverable		17.1us-gaap_IncomeTaxReceivable
Provision (benefit) for income taxes	626.4us-gaap_IncomeTaxExpenseBenefit	554.6us-gaap_IncomeTaxExpenseBenefit	415.4us-gaap_IncomeTaxExpenseBenefit
Interest Expense or Benefit
Income Taxes [Line Items]
Provision (benefit) for income taxes	$ 0	$ (0.2)	$ 0

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due. This amount is the total of current and noncurrent accrued income taxes.

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