Accumulated Other Comprehensive Loss - Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
Total net sales	$ 1,166.7	$ 948.3	$ 2,157.9	$ 1,800.6
Cost of goods sold	818.8	652.8	1,527.1	1,242.5
Other (expense) income, net	(4.1)	(6.1)	(10.6)	(11.9)
Income before income taxes	134.0	116.7	209.8	207.6
Provision for income taxes	31.6	35.9	47.6	62.9
Net income	102.4	80.8	162.2	144.7
Prior-service costs | Reclassification out of Accumulated Other Comprehensive Income
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
Other (expense) income, net	0.3	0.2	0.5	0.4
Actuarial gains/(losses) | Reclassification out of Accumulated Other Comprehensive Income
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
Other (expense) income, net	(2.8)	(2.7)	(5.6)	(5.5)
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) income, net	0.0	(0.5)	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	(2.5)	(3.0)	(5.1)	(5.6)
Provision for income taxes	(0.6)	(1.0)	(1.2)	(1.9)
Net income	(1.9)	(2.0)	(3.9)	(3.7)
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	(1.9)	(1.9)	(4.1)	(3.7)
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	(0.1)	0.1	(0.3)	0.0
Provision for income taxes	(0.1)	0.0	(0.1)	0.0
Net income	0.0	0.1	(0.2)	0.0
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)	0.0	(0.1)	0.0
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	$ 0.0	$ 0.1	$ (0.2)	$ 0.0