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Income Tax (Benefit) Provision (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Tax Disclosure [Abstract]        
(Benefit) Provision for income taxes $ (19.0) $ 14.0 $ (29.4) $ 46.9
Effective tax rate 38.20% 35.30% 37.90% 34.80%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00% 35.00% 35.00% 35.00%