Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 277.8	$ 186.6	$ 205.8
Other comprehensive income (loss):
Foreign currency translation adjustments	(11.6)	(58.7)	(45.7)
Net change in pension and post-retirement benefit liabilities	10.4	5.7	(75.9)
Change in fair value of available-for-sale marketable equity securities	(2.1)	1.2	0.7
Net change in fair value of cash flow hedges	9.8	(18.4)	(12.1)
Reclassification of pension and post-retirement benefit losses into earnings	6.3	9.7	6.9
Reclassification of cash flow hedge losses into earnings	12.3	12.5	5.7
Other comprehensive income (loss) before taxes	25.1	(48.0)	(120.4)
Tax (expense) benefit	(15.5)	(3.2)	28.0
Other comprehensive income (loss), net of tax	9.6	(51.2)	(92.4)
Comprehensive income	$ 287.4	$ 135.4	$ 113.4