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Fair Value Disclosure Fair Value Disclosure - Impacts of Derivative Instrument on Statement of Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest Expense	$ (50.0)	$ (47.4)	$ (103.6)	$ (92.9)
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Income into Income	1.0	4.8	(3.1)	(0.1)
Other Nonoperating Income (Expense)	(8.1)	(3.0)	(9.4)	(11.0)
Fair Value, Recurring [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative liability	1.0		1.0		$ 0.0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative liability	0.0		0.0		0.0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative liability	1.0		1.0		0.0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative liability	0.0		0.0		0.0
Interest Rate Contract [Member] \| Fair Value, Recurring [Member] \| Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative liability					0.0
Interest Rate Contract [Member] \| Fair Value, Recurring [Member] \| Designated as Hedging Instrument [Member] \| Fair Value, Inputs, Level 1 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative liability					0.0
Interest Rate Contract [Member] \| Fair Value, Recurring [Member] \| Designated as Hedging Instrument [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative liability					0.0
Interest Rate Contract [Member] \| Fair Value, Recurring [Member] \| Designated as Hedging Instrument [Member] \| Fair Value, Inputs, Level 3 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative liability					0.0
Foreign Exchange Contract [Member] \| Fair Value, Recurring [Member] \| Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative liability	0.0		0.0		0.0
Foreign Exchange Contract [Member] \| Fair Value, Recurring [Member] \| Designated as Hedging Instrument [Member] \| Fair Value, Inputs, Level 1 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative liability	0.0		0.0		0.0
Foreign Exchange Contract [Member] \| Fair Value, Recurring [Member] \| Designated as Hedging Instrument [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative liability	0.0		0.0		0.0
Foreign Exchange Contract [Member] \| Fair Value, Recurring [Member] \| Designated as Hedging Instrument [Member] \| Fair Value, Inputs, Level 3 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative liability	0.0		0.0		0.0
Foreign Exchange Contract [Member] \| Fair Value, Recurring [Member] \| Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative liability	1.0		1.0		0.0
Foreign Exchange Contract [Member] \| Fair Value, Recurring [Member] \| Not Designated as Hedging Instrument [Member] \| Fair Value, Inputs, Level 1 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative liability	0.0		0.0		0.0
Foreign Exchange Contract [Member] \| Fair Value, Recurring [Member] \| Not Designated as Hedging Instrument [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative liability	1.0		1.0		0.0
Foreign Exchange Contract [Member] \| Fair Value, Recurring [Member] \| Not Designated as Hedging Instrument [Member] \| Fair Value, Inputs, Level 3 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative liability	0.0		0.0		$ 0.0
Cash Flow Hedging [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Loss (Gain) Recognized in Other Comprehensive Income	0.9	8.1	(3.9)	4.2
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	(0.4)	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	0.9	8.5	(3.9)	4.7
Interest Expense [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Income into Income	0.5	0.4	1.1	0.8
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	1.1	0.2	2.4	(6.7)
Derivatives designated as hedging instruments	(1.1)	(0.2)	(2.4)	6.7
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	(0.5)	(0.4)	(1.1)	(0.8)
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	0.5	4.4	(4.2)	(0.9)
Gain (loss) on non-designated derivative contracts	(3.7)	(4.5)	(1.7)	2.4
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	$ (0.5)	$ (4.4)	$ 4.2	$ 0.9