Derivative Financial Instruments and Credit Risk - Gain (Loss) on Derivatives Not Designated as Hedging Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Foreign exchange contracts	$ 2.0	$ (2.0)	$ 0.4
Remeasurement of assets and liabilities in foreign currencies	(2.6)	0.4	(1.3)
Net loss on foreign currency transactions	(0.6)	(1.6)	(0.9)
Revenue
Derivative [Line Items]
Foreign exchange contracts	0.2	(0.5)	0.8
Cost of products
Derivative [Line Items]
Foreign exchange contracts	0.8	(0.5)	(0.3)
Other expense, net
Derivative [Line Items]
Foreign exchange contracts	$ 1.0	$ (1.0)	$ (0.1)