Adoption of ASC 606 (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, net	$ 296.7		$ 296.7		$ 278.2	$ 253.2
Inventories	208.2		208.2		194.4	215.2
Other current assets	36.5		36.5		30.8	39.2
Other current liabilities	86.2		86.2		63.3	77.0
Deferred income taxes	11.8		11.8		13.4	10.4
Other long-term liabilities	42.4		42.4		37.7	42.6
Retained earnings	1,258.0		1,258.0		1,189.6	$ 1,178.2
Net sales	447.5	$ 397.6	863.2	$ 785.3
Cost of goods and services sold	305.3	272.6	586.6	526.1
Research and Development Expense	10.8	10.0	20.4	20.3
Other expense	1.1	11.7	4.2	12.6
Income tax expense	(6.0)	(2.9)	(18.5)	(5.1)
Net income	(56.1)	$ (38.8)	(99.7)	$ (99.7)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, net	19.9		19.9		25.0
Inventories	(16.8)		(16.8)		(20.8)
Other current assets	(9.6)		(9.6)		(8.4)
Other current liabilities	(10.3)		(10.3)		(13.7)
Deferred income taxes	1.8		1.8		3.0
Other long-term liabilities	(4.7)		(4.7)		(4.9)
Retained earnings	6.7		6.7		$ 11.4
Net sales	(5.1)		(7.7)
Cost of goods and services sold	(0.6)		(2.0)
Research and Development Expense	(0.1)		(0.1)
Other expense	0.2		0.3
Income tax expense	0.8		1.2
Net income	3.8		4.7
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, net	276.8		276.8
Inventories	225.0		225.0
Other current assets	46.1		46.1
Other current liabilities	96.5		96.5
Deferred income taxes	10.0		10.0
Other long-term liabilities	47.1		47.1
Retained earnings	1,251.3		1,251.3
Net sales	452.6		870.9
Cost of goods and services sold	305.9		588.6
Research and Development Expense	10.9		20.5
Other expense	0.9		3.9
Income tax expense	(6.8)		(19.7)
Net income	$ (59.9)		$ (104.4)