Accumulated Other Comprehensive Loss - Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net sales	$ 1,078.4	$ 1,090.3
Cost of goods sold	788.6	776.8
Total before tax	101.5	99.9
Tax benefit (expense)	(22.4)	(24.2)
Gain (loss) net of tax	79.1	75.7
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gain (loss) net of tax	(2.3)	(1.5)
Cash flow hedges gain (loss): | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net sales	(0.1)	0.1
Cost of goods sold	(0.3)	0.2
Total before tax	(0.4)	0.3
Tax benefit (expense)	0.1	(0.1)
Gain (loss) net of tax	(0.3)	0.2
Pension and post retirement benefit plan adjustment | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before tax	(2.7)	(2.3)
Tax benefit (expense)	0.7	0.6
Gain (loss) net of tax	(2.0)	(1.7)
Prior-service costs | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before tax	0.0	0.1
Actuarial gains/(losses) | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before tax	$ (2.7)	$ (2.4)