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Derivative Instruments and Fair Value Accounting FX Hedge (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Foreign Currency Fair Value Hedge Derivative [Line Items]
Total stockholders' equity	$ 2,466.1	$ 2,378.9	$ 2,565.1	$ 2,562.0
Foreign Exchange Contract [Member] \| Designated as Hedging Instrument [Member]
Foreign Currency Fair Value Hedge Derivative [Line Items]
Derivative, Notional Amount	35.0
Derivative Asset	(6.7)
Foreign Exchange Contract [Member] \| Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] \| Designated as Hedging Instrument [Member]
Foreign Currency Fair Value Hedge Derivative [Line Items]
Total stockholders' equity	7.6
Foreign Exchange Contract [Member] \| Interest Expense [Member] \| Designated as Hedging Instrument [Member]
Foreign Currency Fair Value Hedge Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(0.8)
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$ 7.6