Accumulated Other Comprehensive Loss - Other Comprehensive Loss Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Reclassification out of Accumulated Other Comprehensive Loss [Line Items]
Net sales	$ 548.0			$ 456.1			$ 1,566.7	$ 1,369.3
Cost of goods and services sold	(353.4)			(308.3)			(1,010.0)	(916.8)
Interest expense	(2.1)			(2.1)			(6.1)	(6.4)
Prior service credit	0.1			0.1			0.4	0.4
Actuarial losses	(0.2)			(0.2)			0.0	(0.2)
Settlements	(1.1)			(2.7)			(3.4)	(2.7)
Income before income taxes	97.7			64.9			286.2	214.4
Tax benefit (expense)	(21.1)			(10.9)			(52.1)	(42.5)
Net income	82.3	$ 91.2	$ 74.3	56.3	$ 66.1	$ 55.4	247.8	177.8
Reclassification out of Accumulated Other Comprehensive Loss
Reclassification out of Accumulated Other Comprehensive Loss [Line Items]
Net income	(0.2)			(4.3)			1.3	2.7
Reclassification out of Accumulated Other Comprehensive Loss | Gains (losses) on derivatives
Reclassification out of Accumulated Other Comprehensive Loss [Line Items]
Income before income taxes	0.6			(3.8)			5.4	6.3
Tax benefit (expense)	(0.3)			1.3			(1.9)	(2.0)
Net income	0.3			(2.5)			3.5	4.3
Reclassification out of Accumulated Other Comprehensive Loss | Amortization of defined benefit pension and other postretirement plans
Reclassification out of Accumulated Other Comprehensive Loss [Line Items]
Prior service credit	0.1			0.1			0.4	0.4
Actuarial losses	0.2			0.2			0.0	0.2
Settlements	(1.1)			(2.7)			(3.4)	(2.7)
Income before income taxes	(0.8)			(2.4)			(3.0)	(2.1)
Tax benefit (expense)	0.3			0.6			0.8	0.5
Net income	(0.5)			(1.8)			(2.2)	(1.6)
Foreign currency contracts | Reclassification out of Accumulated Other Comprehensive Loss | Gains (losses) on derivatives
Reclassification out of Accumulated Other Comprehensive Loss [Line Items]
Net sales	(0.3)			0.3			0.3	0.8
Cost of goods and services sold	(0.1)			0.3			0.3	0.8
Other expense (income)	1.1			(4.3)			5.1	5.0
Forward treasury locks | Reclassification out of Accumulated Other Comprehensive Loss | Gains (losses) on derivatives
Reclassification out of Accumulated Other Comprehensive Loss [Line Items]
Interest expense	$ (0.1)			$ (0.1)			$ (0.3)	$ (0.3)