Accumulated Other Comprehensive Loss - Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net sales	$ 1,103.3	$ 1,204.0	$ 1,196.4	$ 1,087.3	$ 1,144.1	$ 1,179.7	$ 1,166.7	$ 991.2	$ 4,591.0	$ 4,481.7	$ 3,668.8
Cost of goods sold	777.3	842.0	839.0	780.0	823.5	830.7	818.8	708.3	3,238.3	3,181.3	2,513.7
Total before tax									520.5	467.0	443.1
Other expense, net									(21.4)	(17.6)	(21.6)
Gain on disposition of business									21.7	0.0	0.0
Tax (expense) benefit									(113.1)	(100.9)	(193.2)
Net income, gain (loss) net of tax	$ 103.1	$ 132.6	$ 97.9	$ 73.8	$ 89.2	$ 114.7	$ 102.4	$ 59.8	407.4	366.1	$ 249.9
Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income, gain (loss) net of tax									(0.6)	(7.1)
Cash flow hedges gain (loss) | Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net sales									0.3	0.1
Cost of goods sold									0.4	0.3
Total before tax									0.7	0.4
Tax (expense) benefit									(0.2)	(0.1)
Net income, gain (loss) net of tax									0.5	0.3
Amortization of defined benefit pension and post retirement benefit items | Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax									(9.3)	(9.8)
Tax (expense) benefit									2.3	2.4
Net income, gain (loss) net of tax									(7.0)	(7.4)
Prior-service costs | Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax									0.7	0.9
Actuarial gains/(losses) | Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax									(9.7)	(10.7)
Settlement and curtailment losses | Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax									(0.3)	0.0
Reclassification of gains (losses) on available-for-sale securities | Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense, net									(1.8)	0.0
Tax (expense) benefit									0.0	0.0
Net income, gain (loss) net of tax									(1.8)	0.0
Reclassification of currency translation gain | Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on disposition of business									7.7	0.0
Tax (expense) benefit									0.0	0.0
Net income, gain (loss) net of tax									$ 7.7	$ 0.0