Other Expense Restructuring and Related Charges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Severance charges	$ 0.0	$ (1.5)	$ 0.0	$ 6.4
Asset impairment charges, trademark				10.0
Asset impairment charges, patent and equipment				5.0
Restructuring and related charges		(1.5)		21.4
Restructuring Reserve [Roll Forward]
Balance, December 31, 2016			5.9	0.0	$ 0.0
Charges	0.0	$ (1.5)	0.0	21.4	26.4
Cash payments			(1.7)		(3.0)
Non-cash asset-write-downs					(17.5)
Balance, June 30, 2017	4.2		4.2		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			(1.7)		(3.0)
Non-cash asset-write-downs					0.0
Balance, June 30, 2017	4.2		4.2		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, June 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, June 30, 2017	$ 0.0		$ 0.0		$ 0.0