Fair Value Disclosure - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) Instrument	Dec. 31, 2019 USD ($) Instrument	Dec. 31, 2018 USD ($)
Derivative [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	$ (14.9)	$ 11.8	$ 7.4
Gain (loss) on cash flow hedges expected to be reclassified within next twelve months	1.9
Gain (loss) on cash flow hedges expected to be reclassified within next twelve months, net of tax	1.4
Derivative liability	$ 0.0	13.6
Document Period End Date	Dec. 31, 2020
Cash Flow Hedging [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax	$ 19.6	(19.0)	(12.6)
Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax	(0.5)	0.5	0.0
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax	$ 20.1	$ (19.5)	(12.6)
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Interest Rate Contract [Member]
Derivative [Line Items]
Number of derivative instruments | Instrument	5	8
Derivative, Notional Amount	$ 300.0	$ 450.0
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Derivative [Line Items]
Number of derivative instruments | Instrument	1	7
Derivative, Notional Amount	$ 105.7	$ 336.5
Recourse Debt [Member]
Derivative [Line Items]
Carrying Amount of the Hedged Assets/(Liabilities)	(303.6)	(449.9)
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)	5.6	1.4
Other Nonoperating Income (Expense) [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(12.8)	14.3	11.7
Interest Expense [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	$ (2.1)	$ (2.5)	$ (4.2)