Derivatives and Hedging Activities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Foreign Currency Cash Flow Hedge Asset at Fair Value	$ 0.9		$ 0.5
Derivative, Notional Amount	412.2		386.9
Foreign Currency Cash Flow Hedge Liability at Fair Value	1.5		2.1
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	1.6		0.8
Derivative Asset	2.5		1.3
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value	10.2		5.0
Derivative Liability	11.7		$ 7.1
Unrealized Gain on Foreign Currency Derivatives, before Tax	(0.4)	$ (1.1)
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	(1.2)	0.3
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	(0.2)	(0.1)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(1.4)	0.2
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	$ (4.4)	$ (1.2)