Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 37.9	$ 43.5
Other comprehensive income:
Foreign currency translation adjustments	7.9	15.9
Net change in pension and post-retirement liabilities	(2.3)	(2.3)
Reclassification of pension and post-retirement benefit losses into earnings	2.3	1.9
Change in available-for-sale marketable equity securities	(1.8)	0.8
Net change in fair value of cash flow hedges	(4.3)	6.4
Reclassification of cash flow hedge gains into earnings	(4.6)	(3.0)
Other comprehensive income before income taxes	(2.8)	19.7
Income tax expense	(21.1)	(1.1)
Other comprehensive (loss) income, net of tax	(23.9)	18.6
Comprehensive income	$ 14.0	$ 62.1