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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Apr. 04, 2017
Income Tax Contingency [Line Items]
Effective tax rate (as a percent)	27.60%	39.00%	101.10%	37.90%
Statutory rate (as a percent)	35.00%		35.00%
Reversal of valuation allowance	$ 15.4
Dow \| Amendment agreement
Income Tax Contingency [Line Items]
Deferred tax liabilities					$ 40.0