Discontinued Operations Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue	$ 0.0	$ 334.8	$ 0.0	$ 966.0
Disposal Group, Including Discontinued Operation, Costs of Goods Sold	0.0	295.6	0.1	786.5
Disposal Group, Including Discontinued Operation, General and Administrative Expense	0.5	35.6	2.8	102.0
Disposal Group, Including Discontinued Operation, Other Income		(0.2)
Disposal Group, Including Discontinued Operation, Other Expense	0.0		0.0	1.9
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	(0.5)	3.8	(2.9)	75.6
Discontinued Operation, Tax Effect of Discontinued Operation	(0.1)	4.0	(0.6)	21.2
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ (0.4)	$ (0.2)	$ (2.3)	$ 54.4

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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