Fair Value Disclosure (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Income into Income	$ (11.8)	$ (7.4)	$ 45.8
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	17.4	12.9	(39.6)
Other Nonoperating Income (Expense) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Income into Income	(14.3)	(11.7)	38.9
Interest Expense [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Income into Income	2.5	4.2	6.8
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member] | Other Nonoperating Income (Expense) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	14.3	11.7	(38.9)
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member] | Interest Expense [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		0.0	0.0
Interest Rate Contract [Member] | Other Nonoperating Income (Expense) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments		0.0	0.0
Interest Rate Contract [Member] | Interest Expense [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	(9.0)	3.0	5.3
Interest Rate Contract [Member] | Cash Flow Hedging [Member] | Other Nonoperating Income (Expense) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		0.0	0.0
Interest Rate Contract [Member] | Cash Flow Hedging [Member] | Interest Expense [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(2.5)	(4.2)	(6.8)
Operating Expense [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Income into Income	0.0	0.1	$ 0.1
Carrying Amount [Member]
Liabilities
Recourse fixed rate debt	4,389.3	3,933.4
Recourse floating rate debt	417.5	522.7
Estimate of Fair Value Measurement [Member]
Liabilities
Recourse fixed rate debt	4,644.6	3,836.0
Recourse floating rate debt	$ 419.0	$ 515.1