Fair Value Disclosure Fair Value Disclosure - Impacts of Derivative Instrument on Statement of Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest Expense	$ (190.3)	$ (180.5)	$ (162.9)
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Income into Income	14.9	(11.8)	(7.4)
Other Nonoperating Income (Expense)	(13.0)	(7.3)	(21.7)
Operating Lease, Expense	(49.3)	(54.4)	(49.6)
Cash Flow Hedging [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Loss (Gain) Recognized in Other Comprehensive Income	19.6	(19.0)	(12.6)
Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Loss (Gain) Recognized in Other Comprehensive Income	(0.5)	0.5	0.0
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Loss (Gain) Recognized in Other Comprehensive Income	20.1	(19.5)	(12.6)
Interest Expense [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Income into Income	2.1	2.5	4.2
Gain (loss) on non-designated derivative contracts		0.0	0.0
Interest Expense [Member] | Interest Rate Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged items	(4.2)	(9.0)	3.0
Derivatives designated as hedging instruments	4.2	9.0	(3.0)
Interest Expense [Member] | Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of gain (loss) reclassified from accumulated other comprehensive income into income	(2.1)	(2.5)	(4.2)
Interest Expense [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of gain (loss) reclassified from accumulated other comprehensive income into income		0.0	0.0
Other Nonoperating Income (Expense) [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Income into Income	12.8	(14.3)	(11.7)
Gain (loss) on non-designated derivative contracts	6.2	(1.7)	2.2
Other Nonoperating Income (Expense) [Member] | Interest Rate Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged items		0.0	0.0
Derivatives designated as hedging instruments		0.0	0.0
Other Nonoperating Income (Expense) [Member] | Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of gain (loss) reclassified from accumulated other comprehensive income into income		0.0	0.0
Other Nonoperating Income (Expense) [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of gain (loss) reclassified from accumulated other comprehensive income into income	(12.8)	14.3	11.7
Operating Expense [Member] | Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of gain (loss) reclassified from accumulated other comprehensive income into income		0.0	(0.1)
Operating Expense [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Income into Income	$ 0.0	$ 0.0	$ 0.1