New Accounting Standards (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidated Statements of Operations [Abstract]
Revenues		$ 2,689.8	$ 2,375.4	$ 1,939.4
Cost of sales		1,677.3	1,477.5	1,222.7
Provision (benefit) for income taxes		80.1	(131.2)	(31.9)
Net income (loss)		269.4	18.5	$ (31.3)
Assets [Abstract]
Inventories		523.9	494.5
Other current assets		60.7	39.5
Liabilities and Stockholders' Equity [Abstract]
Accrued liabilities		248.5	271.2
Accumulated deficit		(308.7)	$ (577.8)
Adjustments [Member] | ASC 606 [Member]
Consolidated Statements of Operations [Abstract]
Revenues		(26.5)
Cost of sales		(15.0)
Provision (benefit) for income taxes		(3.1)
Net income (loss)		(8.4)
Assets [Abstract]
Inventories		15.0
Other current assets	[1]	(16.9)
Liabilities and Stockholders' Equity [Abstract]
Accrued liabilities		6.5
Accumulated deficit		(8.4)
Balance Without Adoption of ASC 606 [Member] | ASC 606 [Member]
Consolidated Statements of Operations [Abstract]
Revenues		2,663.3
Cost of sales		1,662.3
Provision (benefit) for income taxes		77.0
Net income (loss)		261.0
Assets [Abstract]
Inventories		538.9
Other current assets		43.8
Liabilities and Stockholders' Equity [Abstract]
Accrued liabilities		255.0
Accumulated deficit		$ (317.1)

[1] Adjustment represents "Contract asset." See Note 14 "Revenue from Contracts with Customers" for an explanation of the Contract assets account included in "Other current assets" in the Consolidated Balance Sheets.