Derivatives and Hedging Instruments - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020
Derivative [Line Items]
Foreign currency cash flow hedge in AOCI to be reclassified in next 12 months	$ (16,300,000)	$ 35,400,000
Cross-currency interest rate swaps | Designated as hedging instruments
Derivative [Line Items]
Derivative notional amount	750,000,000.0	3,300,000,000
Foreign currency forward contracts | Not designated as hedging instruments
Derivative [Line Items]
Derivative notional amount	2,500,000,000	3,400,000,000
Net Investment Hedging | Foreign currency debt | Designated as hedging instruments
Derivative [Line Items]
Derivative notional amount	4,100,000,000	1,900,000,000
Net Investment Hedging | Foreign currency forward contracts | Designated as hedging instruments
Derivative [Line Items]
Derivative notional amount	0	355,600,000
Cash flow hedge instruments | Foreign currency forward and option contracts
Derivative [Line Items]
Derivative notional amount	824,800,000	912,900,000
Cash flow hedge instruments | Interest Rate Lock Commitments
Derivative [Line Items]
Derivative notional amount	0	0
Derivative, Notional Amount, Amount Settled		1,900,000,000
Interest rate cash flow hedge in AOCI to be reclassified in next 12 months		4,100,000
Cash flow hedges, gain (loss)		$ (31,600,000)
Cash flow hedge instruments | Treasury Lock
Derivative [Line Items]
Derivative notional amount	1,500,000,000
Cash flow hedges, gain (loss)	$ 5,100,000