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Summary of Significant Accounting Policies Fair Values of Derivative Instruments Included on Consolidated Balance Sheet (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	$ 224.7	$ 206.3
Liability Derivatives Fair Value	11.3	16.6
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(20.4)	48.9	$ (39.4)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	12.0
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	31.6	34.7
Liability Derivatives Fair Value	6.4	13.9
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	193.1	171.6
Liability Derivatives Fair Value	4.9	2.7
Gain (Loss) Recognized in Income on Derivative	86.0	22.5
Royalty Arrangement
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 754.7
Period covered by hedge	18 months
Foreign currency \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Income on Derivative	$ 14.2	22.1
Foreign currency \| Prepaid expenses and other current assets \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	10.0	30.9
Foreign currency \| Prepaid expenses and other current assets \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	12.4	4.5
Foreign currency \| Accrued payroll and other liabilities \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value	5.2	0.7
Foreign currency \| Accrued payroll and other liabilities \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value	4.8	0.0
Foreign currency \| Miscellaneous other assets \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	9.5	3.8
Foreign currency \| Other long- term liabilities \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value	1.2	1.3
Interest rate \| Accrued payroll and other liabilities \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value	0.0	0.1
Interest rate \| Miscellaneous other assets \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	12.1	0.0
Interest rate \| Other long- term liabilities \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value	0.0	11.8
Equity \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Income on Derivative	71.8	0.4
Equity \| Prepaid expenses and other current assets \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	1.6	167.1
Equity \| Accrued payroll and other liabilities \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value	0.1	2.7
Equity \| Miscellaneous other assets \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	179.1	$ 0.0
Fair Value Hedging [Member] \| Interest Rate Risk [Member]
Derivatives, Fair Value [Line Items]
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments	12.1
Gain (Loss) Recognized in Income on Derivative	24.0
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	998.5
Intercompany Debt [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Nonderivative Instruments	642.6
Debt [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Nonderivative Instruments	$ 11,900.0