Derivative Instruments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Derivatives, Notional Amount [Line Items]
Notional amount of derivatives	$ 1,978.2		$ 1,846.2
Designated derivatives:
Derivatives, Notional Amount [Line Items]
Notional amount of derivatives	1,795.6		1,672.1
Cash flow hedges:
Derivatives, Notional Amount [Line Items]
Derivative instruments, gain (loss) recognized in other comprehensive income (loss), effective portion	$ 53.0	$ (29.1)
Cash flow hedges: | Designated derivatives:
Derivatives, Notional Amount [Line Items]
Maximum maturities of cash flow hedge derivatives	36 months
Losses expected to be reclassified into earnings within the next 12 months	$ 20.2
Interest rate lock contracts | Cash flow hedges: | Designated derivatives:
Derivatives, Notional Amount [Line Items]
Notional amount of derivatives	$ 650.0		650.0
Swaps designated as cash flow hedges, expected termination period	5 years
Interest rate swap contracts | Fair value hedges: | Designated derivatives:
Derivatives, Notional Amount [Line Items]
Notional amount of derivatives	$ 300.0		300.0
Foreign exchange contracts
Derivatives, Notional Amount [Line Items]
Foreign currency forward contracts, amounts reclassified out of AOCI	10.0	$ (1.5)
Foreign exchange contracts | Cash flow hedges: | Designated derivatives:
Derivatives, Notional Amount [Line Items]
Notional amount of derivatives	$ 845.6		$ 722.1
Minimum | Foreign exchange contracts
Derivatives, Notional Amount [Line Items]
Maturity of foreign currency derivatives	1 month
Maximum | Foreign exchange contracts
Derivatives, Notional Amount [Line Items]
Maturity of foreign currency derivatives	4 months
Maximum | Interest rate swap contracts
Derivatives, Notional Amount [Line Items]
Derivative expiration period	9 years