Other Expense Restructuring and Related Charges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Severance charges	$ 0.0	$ 1.4	$ 0.0	$ 7.8
Asset impairment charges, trademark				10.0
Asset impairment charges, patent and equipment		0.9		5.9
Restructuring and related charges		2.3		23.7
Restructuring Reserve [Roll Forward]
Balance, December 31, 2016			5.9	0.0	$ 0.0
Charges	0.0	$ 2.3	0.0	23.7	26.4
Cash payments			(2.9)		(3.0)
Non-cash asset-write-downs					(17.5)
Balance, September 30, 2017	3.0		3.0		5.9
Severance and benefits [Member]
Restructuring Reserve [Roll Forward]
Balance, December 31, 2016			5.9	0.0	0.0
Charges					8.9
Cash payments			(2.9)		(3.0)
Non-cash asset-write-downs					0.0
Balance, September 30, 2017	3.0		3.0		5.9
Asset-related charges [Member]
Restructuring Reserve [Roll Forward]
Balance, December 31, 2016			0.0	0.0	0.0
Charges					17.3
Cash payments			0.0		0.0
Non-cash asset-write-downs					(17.3)
Balance, September 30, 2017	0.0		0.0		0.0
Other charges [Member]
Restructuring Reserve [Roll Forward]
Balance, December 31, 2016			0.0	$ 0.0	0.0
Charges					0.2
Cash payments			0.0		0.0
Non-cash asset-write-downs					(0.2)
Balance, September 30, 2017	$ 0.0		$ 0.0		$ 0.0