Summary of Significant Accounting Policies Fair Values of Derivative Instruments Included on Consolidated Balance Sheet (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Fair values of derivatives assets	$ 289.6	$ 227.0
Fair values of derivatives liabilities	(7.9)	(97.5)
Cumulative cash flow hedging losses, after tax	24.8
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Fair values of derivatives assets	79.3	41.4
Fair values of derivatives liabilities	(7.9)	(79.5)
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Fair values of derivatives assets	210.3	185.6
Fair values of derivatives liabilities	0.0	(18.0)
Gain (loss) on the fair value of derivatives	97.4	(0.6)
Debt
Derivatives, Fair Value [Line Items]
Notional amount of nonderivative instruments	12,400.0
Intercompany debt
Derivatives, Fair Value [Line Items]
Notional amount of nonderivative instruments	$ 1,400.0
Royalty arrangement
Derivatives, Fair Value [Line Items]
Period covered by hedge	18 months
Notional amount of derivative	$ 1,300.0
Foreign currency \| Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Gain (loss) on the fair value of derivatives	9.4	(29.0)
Foreign currency \| Prepaid expenses and other current assets \| Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Fair values of derivatives assets	42.4	0.0
Foreign currency \| Prepaid expenses and other current assets \| Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Fair values of derivatives assets	0.5	0.0
Foreign currency \| Accrued payroll and other liabilities \| Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Fair values of derivatives liabilities	(3.3)	(64.5)
Foreign currency \| Accrued payroll and other liabilities \| Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Fair values of derivatives liabilities	0.0	(9.4)
Foreign currency \| Miscellaneous other assets \| Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Fair values of derivatives assets	28.0	5.6
Foreign currency \| Other long-term liabilities \| Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Fair values of derivatives liabilities	(0.5)	(15.0)
Interest rate \| Prepaid expenses and other current assets \| Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Fair values of derivatives assets	0.3	0.0
Interest rate \| Accrued payroll and other liabilities \| Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Fair values of derivatives liabilities	0.0	0.0
Interest rate \| Miscellaneous other assets \| Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Fair values of derivatives assets	8.6	35.8
Interest rate \| Other long-term liabilities \| Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Fair values of derivatives liabilities	(4.1)	0.0
Equity \| Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Gain (loss) on the fair value of derivatives	99.3	44.4
Equity \| Prepaid expenses and other current assets \| Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Fair values of derivatives assets	9.5	185.6
Equity \| Accrued payroll and other liabilities \| Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Fair values of derivatives liabilities	0.0	(8.6)
Equity \| Miscellaneous other assets \| Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Fair values of derivatives assets	200.3	$ 0.0
Fair value hedges \| Interest rate risk
Derivatives, Fair Value [Line Items]
Increase (decrease) in cumulative hedging adjustments	4.8
Gain (loss) on the fair value of derivatives	31.0
Interest rate
Derivatives, Fair Value [Line Items]
Notional amount of derivative	$ 1,500.0

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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