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Income Taxes (Details) - Net Current and Net Long-Term Deferred Tax Assets and Liabilities - USD ($)
$ in Millions
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Net current deferred tax asset $ 0.0   $ 18.7
Net non-current deferred tax asset 29.4   6.5
Net deferred tax assets 29.4   25.2
Net non-current deferred tax liability 678.8 $ 567.1 202.3
Net deferred tax liability $ 649.4   $ 177.1