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Income Taxes - Quarterly Disclosure (Details9) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Investments, Owned, Federal Income Tax Note [Line Items]    
Income tax (provision) benefit $ (5.0) $ (2.0)
Discrete tax benefits (expense)   $ 1.3
Effective income tax rate 7.60% 8.70%