Other Expense Restructuring and Related Charges (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Payments to acquire property, plant, and equipment	$ 28.0	$ 37.5
Severance charges	2.0	0.0
Other charges	1.2	0.0
Restructuring and related charges	3.3
Restructuring Reserve [Roll Forward]
Charges	3.3	$ 0.0
2018 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Severance charges	2.0
Asset impairment charges, patent and equipment	0.1
Other charges	1.2
Restructuring and related charges	3.3
Restructuring Reserve [Roll Forward]
Charges	3.3
Non-cash asset-write-downs	(1.3)
Balance, March 31, 2018	2.0
2018 Restructuring Plan [Member] | Severance and benefits [Member]
Restructuring Reserve [Roll Forward]
Charges	2.0
Non-cash asset-write-downs	0.0
Balance, March 31, 2018	2.0
2018 Restructuring Plan [Member] | Asset-related charges [Member]
Restructuring Reserve [Roll Forward]
Charges	0.1
Non-cash asset-write-downs	(0.1)
Balance, March 31, 2018	0.0
2018 Restructuring Plan [Member] | Other charges [Member]
Restructuring Reserve [Roll Forward]
Charges	1.2
Non-cash asset-write-downs	(1.2)
Balance, March 31, 2018	0.0
2018 Restructuring Plan [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost			$ 8.0
Payments to acquire property, plant, and equipment			9.0
Effect on future earnings			17.0
2018 Restructuring Plan [Member] | Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost			13.0
Payments to acquire property, plant, and equipment			14.0
Effect on future earnings			$ 22.0
2016 Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Balance, March 31, 2018	$ 1.8