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Income Taxes - Quarterly Disclosure (Details9) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Investments, Owned, Federal Income Tax Note [Line Items]        
Income tax (provision) benefit $ 4.3 $ (23.4) $ 64.4 $ (23.7)
Effective Income Tax Rate Reconciliation, Percent 0.80%   9.10%  
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount $ 173.1 $ 63.9    
Amount of valuation allowance in the effective tax rate   6.00%    
Discrete tax benefits (expense) $ (4.1)   $ (0.5) $ (57.9)
Effective tax rate excluding valuation allowance 34.10%      
Discrete Item [Member]        
Investments, Owned, Federal Income Tax Note [Line Items]        
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount   $ 56.6    
Part of Effective Tax Rate [Member]        
Investments, Owned, Federal Income Tax Note [Line Items]        
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount   $ 7.3