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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Federal statutory rate $ (0.6) $ 31.9 $ 20.8
Adjustment to valuation allowances (6.9) (20.0) 1.0
Adjustment of uncertain tax positions (3.7) (2.6) 0.9
State taxes, net of federal benefit (2.0) 2.0 (2.1)
Foreign rate differential (0.8) (2.9) (4.8)
Impact from foreign branches 2.6 7.1 3.6
Adjustment of deferred tax liabilities 1.4 (1.7) 2.2
Federal rate change (0.8) (28.8) 0.0
Domestic production activity deduction 0.0 (0.9) (3.3)
Loss on foreign investment 0.0 0.0 (4.7)
Other 1.0 (0.1) (0.6)
Total income tax (benefit) expense $ (9.8) $ (16.0) $ 13.0