Derivative Instruments - Notional Amount (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Notional amount	$ 1,846,200,000	$ 946,900,000
Designated derivatives:
Derivatives, Fair Value [Line Items]
Notional amount	1,672,100,000	784,000,000.0
Non-designated derivatives
Derivatives, Fair Value [Line Items]
Notional amount	174,100,000	162,900,000
Foreign exchange contracts | Cash flow hedges: | Designated derivatives:
Derivatives, Fair Value [Line Items]
Notional amount	722,100,000	484,000,000.0
Interest rate lock contracts | Cash flow hedges: | Designated derivatives:
Derivatives, Fair Value [Line Items]
Notional amount	650,000,000.0	0
Interest rate swap contracts | Fair value hedges: | Designated derivatives:
Derivatives, Fair Value [Line Items]
Notional amount	$ 300,000,000.0	$ 300,000,000.0