Restructuring and Repositioning Expenses - Restructuring Liability (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring Reserve [Roll Forward]
Beginning balance			$ 10.2		$ 10.2
Ending balance	$ 4.8				4.8
Asset impairments	0.1			$ 4.1	4.1	$ 4.5
Other Costs
Restructuring Reserve [Roll Forward]
Expense	0.1				0.5
Asset impairments | SCC
Restructuring Reserve [Roll Forward]
Asset impairments	0.1				1.0
Asset impairments | SBM
Restructuring Reserve [Roll Forward]
Asset impairments	0.0				3.1
2019 Plan | Severance and other employee costs
Restructuring Reserve [Roll Forward]
Beginning balance	0.0	$ 0.0	0.0		0.0
Expense	0.7	0.0	0.0
Payments	(0.3)	0.0	0.0
Impact of foreign currency and other	0.0	0.0	0.0
Ending balance	0.4	0.0	0.0		0.4
2019 Phase 2 Plan | Severance and other employee costs
Restructuring Reserve [Roll Forward]
Beginning balance	0.0	0.0	0.0		0.0
Expense	2.9	0.0	0.0
Payments	(0.5)	0.0	0.0
Impact of foreign currency and other	0.0	0.0	0.0
Ending balance	2.4	0.0	0.0		2.4
2018 Plan | Severance and other employee costs
Restructuring Reserve [Roll Forward]
Beginning balance	3.5	5.8	7.7		7.7
Expense	(0.1)	0.0	0.4
Payments	(1.6)	(2.3)	(2.2)
Impact of foreign currency and other	(0.1)	0.0	(0.1)
Ending balance	1.7	3.5	5.8		1.7
2018 Plan | Facility exit costs
Restructuring Reserve [Roll Forward]
Beginning balance	0.0	0.1	0.2		0.2
Expense	0.0	0.0	0.0
Payments	0.0	(0.1)	(0.1)
Impact of foreign currency and other	0.0	0.0	0.0
Ending balance	0.0	0.0	0.1		0.0
2018 Plan | Other Costs
Restructuring Reserve [Roll Forward]
Beginning balance	0.1	0.1	0.0		0.0
Expense	0.1	0.2	0.1
Payments	(0.1)	(0.2)	0.0
Impact of foreign currency and other	0.0	0.0	0.0
Ending balance	0.1	0.1	0.1		0.1
2017 Plan | Severance and other employee costs
Restructuring Reserve [Roll Forward]
Beginning balance	0.2	0.3	1.8		1.8
Expense	0.1	(0.1)	0.0
Payments	(0.1)	(0.1)	(1.5)
Impact of foreign currency and other	0.0	0.1	0.0
Ending balance	0.2	0.2	0.3		0.2
Other plans
Restructuring Reserve [Roll Forward]
Beginning balance	0.0	0.1	0.5		0.5
Expense	0.0	0.3	(0.1)
Payments	0.0	(0.4)	(0.2)
Impact of foreign currency and other	0.0	0.0	(0.1)
Ending balance	0.0	0.0	0.1		0.0
Total
Restructuring Reserve [Roll Forward]
Beginning balance	3.8	6.4	10.2		10.2
Expense	3.7	0.4	0.4
Payments	(2.6)	(3.1)	(4.0)
Impact of foreign currency and other	(0.1)	0.1	(0.2)
Ending balance	$ 4.8	$ 3.8	$ 6.4		$ 4.8