Accumulated Other Comprehensive Loss - Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
Total net sales	$ 1,179.7	$ 950.5	$ 3,337.6	$ 2,751.1
Cost of goods sold	830.7	642.9	2,357.8	1,885.4
Other expense, net	(2.9)	(4.8)	(13.5)	(16.7)
Income before income taxes	142.5	123.6	352.3	331.2
Provision for income taxes	(27.8)	(40.8)	(75.4)	(103.7)
Net income	114.7	82.8	276.9	227.5
Prior-service costs | Reclassification out of Accumulated Other Comprehensive Income
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
Other expense, net	0.2	0.3	0.7	0.7
Actuarial gains/(losses) | Reclassification out of Accumulated Other Comprehensive Income
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
Other expense, net	(2.6)	(3.0)	(8.2)	(8.5)
Settlement and curtailment losses | Reclassification out of Accumulated Other Comprehensive Income
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
Other expense, net	0.0	0.0	0.0	(0.5)
Amortization of defined benefit pension and post retirement benefit items | Reclassification out of Accumulated Other Comprehensive Income
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
Income before income taxes	(2.4)	(2.7)	(7.5)	(8.3)
Provision for income taxes	0.5	0.9	1.7	2.8
Net income	(1.9)	(1.8)	(5.8)	(5.5)
AOCI Attributable to Parent | Reclassification out of Accumulated Other Comprehensive Income
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
Net income	(1.7)	(2.2)	(5.8)	(5.9)
Forward Contracts | Cash flow hedge (loss) gain | Reclassification out of Accumulated Other Comprehensive Income
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
Income before income taxes	0.3	(0.6)	0.0	(0.6)
Provision for income taxes	(0.1)	0.2	0.0	0.2
Net income	0.2	(0.4)	0.0	(0.4)
Net sales | Forward Contracts | Cash flow hedge (loss) gain | Reclassification out of Accumulated Other Comprehensive Income
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
Total net sales	0.1	(0.2)	0.0	(0.2)
Cost of goods sold | Forward Contracts | Cash flow hedge (loss) gain | Reclassification out of Accumulated Other Comprehensive Income
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
Cost of goods sold	$ 0.2	$ (0.4)	$ 0.0	$ (0.4)