Derivative Instruments - Notional Amount (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Notional amount of derivatives	$ 1,825,000,000.0	$ 946,900,000
Designated derivatives:
Derivative [Line Items]
Notional amount of derivatives	1,661,700,000	784,000,000.0
Non-designated derivatives
Derivative [Line Items]
Notional amount of derivatives	163,300,000	162,900,000
Foreign currency contracts | Cash flow hedges: | Designated derivatives:
Derivative [Line Items]
Notional amount of derivatives	711,700,000	484,000,000.0
Interest rate lock contracts | Cash flow hedges: | Designated derivatives:
Derivative [Line Items]
Notional amount of derivatives	650,000,000.0	0
Interest rate swap contracts | Fair value hedges: | Designated derivatives:
Derivative [Line Items]
Notional amount of derivatives	$ 300,000,000.0	$ 300,000,000.0