Other Expense Restructuring and Related Charges (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Payments to Acquire Property, Plant, and Equipment	$ 104.7	$ 130.8	$ 170.2
Severance charges	3.1	0.0	8.9
Other restructuring charges	3.8	0.0	0.2
Restructuring Reserve [Roll Forward]
Balance, December 31, 2017	2.1
Charges	9.1	0.0	26.4
Non-cash asset write-downs	(2.2)	(0.7)	(17.5)
Balance, December 31, 2018	3.3	2.1
Severance and benefits [Member]
Restructuring Reserve [Roll Forward]
Balance, December 31, 2017	0.0
Charges	3.1
Cash payments	(0.8)
Non-cash asset write-downs	0.0
Balance, December 31, 2018	2.3	0.0
Asset-related charges [Member]
Restructuring Reserve [Roll Forward]
Balance, December 31, 2017	0.0
Charges	2.2
Cash payments	0.0
Non-cash asset write-downs	(2.2)
Balance, December 31, 2018	0.0	0.0
Other charges [Member]
Restructuring Reserve [Roll Forward]
Balance, December 31, 2017	0.0
Charges	3.5
Cash payments	0.0
Non-cash asset write-downs	(3.5)
Balance, December 31, 2018	0.0	0.0
2018 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	8.8
Severance charges	3.1
Asset impairment charges, patent and equipment	2.2
Other restructuring charges	3.5
Restructuring Reserve [Roll Forward]
Balance, December 31, 2017	0.0
Charges	8.8
Cash payments	(0.8)
Non-cash asset write-downs	(5.7)
Balance, December 31, 2018	2.3	$ 0.0
2016 Restructuring Plan [Member] [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0.3
Asset impairment charges, patent and equipment			$ 4.5
Restructuring Reserve [Roll Forward]
Balance, December 31, 2018	1.0
Minimum [Member] | 2018 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	8.0
Payments to Acquire Property, Plant, and Equipment	9.0
Maximum [Member] | 2018 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	13.0
Payments to Acquire Property, Plant, and Equipment	$ 14.0