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General Accounting and Disclosure Matters (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Income Tax Disclosure [Abstract]          
Provision for income tax (benefit) $ (7.9) $ 10.0 $ (1.1) $ 14.8  
Restricted cash [Abstract]          
Restricted cash $ 46.1   $ 46.1   $ 0.0