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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]      
Document Period End Date Dec. 31, 2018    
Asset Derivatives Fair Value $ 206.3 $ 167.9  
Liability Derivatives Fair Value 16.6 45.4  
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax 48.9 (39.4) $ 2.9
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax 32.4    
Designated as Hedging Instrument      
Derivatives, Fair Value [Line Items]      
Asset Derivatives Fair Value 34.7 0.6  
Liability Derivatives Fair Value 13.9 38.6  
Not Designated as Hedging Instrument [Member]      
Derivatives, Fair Value [Line Items]      
Asset Derivatives Fair Value 171.6 167.3  
Liability Derivatives Fair Value 2.7 6.8  
Gain (Loss) Recognized in Income on Derivative $ 22.5 68.5  
Royalty Arrangement      
Derivatives, Fair Value [Line Items]      
Period covered by hedge 18 months    
Derivative, Notional Amount $ 726.3    
Foreign currency | Not Designated as Hedging Instrument [Member]      
Derivatives, Fair Value [Line Items]      
Gain (Loss) Recognized in Income on Derivative 22.1 (24.2)  
Foreign currency | Prepaid expenses and other current assets | Designated as Hedging Instrument      
Derivatives, Fair Value [Line Items]      
Asset Derivatives Fair Value 30.9 0.5  
Foreign currency | Prepaid expenses and other current assets | Not Designated as Hedging Instrument [Member]      
Derivatives, Fair Value [Line Items]      
Asset Derivatives Fair Value 4.5 0.0  
Foreign currency | Accrued payroll and other liabilities | Designated as Hedging Instrument      
Derivatives, Fair Value [Line Items]      
Liability Derivatives Fair Value 0.7 31.0  
Foreign currency | Accrued payroll and other liabilities | Not Designated as Hedging Instrument [Member]      
Derivatives, Fair Value [Line Items]      
Liability Derivatives Fair Value 0.0 5.5  
Foreign currency | Miscellaneous other assets | Designated as Hedging Instrument      
Derivatives, Fair Value [Line Items]      
Asset Derivatives Fair Value 3.8 0.1  
Foreign currency | Other long- term liabilities | Designated as Hedging Instrument      
Derivatives, Fair Value [Line Items]      
Liability Derivatives Fair Value 1.3 1.4  
Interest rate | Accrued payroll and other liabilities | Designated as Hedging Instrument      
Derivatives, Fair Value [Line Items]      
Liability Derivatives Fair Value 0.1 0.3  
Interest rate | Miscellaneous other assets | Designated as Hedging Instrument      
Derivatives, Fair Value [Line Items]      
Asset Derivatives Fair Value 0.0 0.0  
Interest rate | Other long- term liabilities | Designated as Hedging Instrument      
Derivatives, Fair Value [Line Items]      
Liability Derivatives Fair Value 11.8 5.9  
Equity | Not Designated as Hedging Instrument [Member]      
Derivatives, Fair Value [Line Items]      
Gain (Loss) Recognized in Income on Derivative 0.4 92.7  
Equity | Prepaid expenses and other current assets | Not Designated as Hedging Instrument [Member]      
Derivatives, Fair Value [Line Items]      
Asset Derivatives Fair Value 167.1 0.0  
Equity | Accrued payroll and other liabilities | Not Designated as Hedging Instrument [Member]      
Derivatives, Fair Value [Line Items]      
Liability Derivatives Fair Value 2.7 1.3  
Equity | Miscellaneous other assets | Not Designated as Hedging Instrument [Member]      
Derivatives, Fair Value [Line Items]      
Asset Derivatives Fair Value 0.0 $ 167.3  
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 (12.0)    
Gain (Loss) Recognized in Income on Derivative 5.8    
Interest Rate Swap [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 738.0    
Intercompany Debt [Member]      
Derivatives, Fair Value [Line Items]      
Notional Amount of Nonderivative Instruments 3,500.0    
Debt [Member]      
Derivatives, Fair Value [Line Items]      
Notional Amount of Nonderivative Instruments $ 10,800.0