Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Narrative (Details)

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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Tax Contingency [Line Items]      
Federal income tax rate   50.00% 37.00%
Tax cuts and jobs act of 2017, income tax expense (benefit) $ (31.0)    
Foreign Tax Credit      
Income Tax Contingency [Line Items]      
Change in deferred tax assets valuation allowance   $ 9.2