Fair Value Disclosure Fair Value Disclosure - Impacts of Derivative Instrument on Statement of Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest Expense	$ (49.8)	$ (48.6)	$ (153.4)	$ (141.5)
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Income into Income	(6.0)	11.0	(9.1)	10.9
Other Nonoperating Income (Expense)	(0.3)	(1.2)	(9.7)	(12.2)
Cash Flow Hedging [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Loss (Gain) Recognized in Other Comprehensive Income	(6.4)	10.5	(10.3)	14.7
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	0.0	0.0	0.0	(0.5)
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	(6.4)	10.5	(10.3)	15.2
Interest Expense [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Income into Income	0.4	0.6	1.5	1.4
Gain (loss) on non-designated derivative contracts	0.0	0.0	0.0	0.0
Interest Expense [Member] | Interest Rate Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged items	0.8	1.3	3.2	(5.4)
Derivatives designated as hedging instruments	(0.8)	(1.3)	(3.2)	5.4
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	(0.4)	(0.6)	(1.5)	(1.4)
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	0.0	0.0
Other (Income) Expense [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Income into Income	(6.4)	10.4	(10.6)	9.5
Gain (loss) on non-designated derivative contracts	2.6	2.2	0.9	4.6
Other (Income) Expense [Member] | Interest Rate Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged items	0.0	0.0	0.0	0.0
Derivatives designated as hedging instruments	0.0	0.0	0.0	0.0
Other (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	0.0	0.0
Other (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	$ 6.4	$ (10.4)	$ 10.6	$ (9.5)