Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 115.5	$ 110.7	$ 159.0	$ 135.6
Other comprehensive income:
Foreign currency translation adjustments	13.3	5.0	29.2	14.4
Net change in pension and post-retirement liabilities	(3.2)	(2.2)	(5.3)	(4.1)
Reclassification of pension and post-retirement benefit losses into earnings	1.9	1.4	3.6	3.1
Change in fair value of available-for-sale marketable equity securities	(0.7)	(0.5)	0.1	(0.6)
Net change in fair value of cash flow hedges	0.6	(3.0)	7.0	(0.6)
Reclassification of cash flow hedge (gains) losses into earnings	(2.8)	3.4	(5.9)	8.2
Other comprehensive income before income taxes	9.1	4.1	28.7	20.4
Income tax benefit (expense)	1.0	0.0	(0.1)	(2.3)
Other comprehensive income, net of tax	10.1	4.1	28.6	18.1
Comprehensive income	$ 125.6	$ 114.8	$ 187.6	$ 153.7