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Narrative (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
year
Dec. 31, 2014
USD ($)
Valuation Allowance [Line Items]            
Valuation allowance for deferred tax assets $ 322.2     $ 322.2 $ 105.1  
Number of Years in Cumulative Loss Profit Position | year         3  
Valuation allowance       171.5 $ 74.5 $ 0.5
Deferred tax asset valuation allowance charge 22.5 $ (173.1) $ (63.9)      
Valuation allowance applicable to other comprehensive income       130.4 121.7 270.3
Income tax refunds received       10.5 63.3 20.2
Operating loss carryforwards, Amount of income utilizable per year $ 5.0     $ 5.0    
Operating loss carryforwards, Amount of income utilizable per year percent 30.00%     30.00%    
Federal and State Deferred Tax Assets [Member]            
Valuation Allowance [Line Items]            
Deferred tax asset valuation allowance charge       $ 165.8 68.4  
State Tax Credits [Member]            
Valuation Allowance [Line Items]            
Valuation allowance for deferred tax assets $ 13.3     13.3 13.8  
State Temporary Differences [Member]            
Valuation Allowance [Line Items]            
Valuation allowance for deferred tax assets 6.5     6.5 3.3  
Accumulated Deferred Tax Asset Valuation Allowance [Member]            
Valuation Allowance [Line Items]            
Valuation allowance applicable to other comprehensive income       45.6 0.0 $ 0.0
Federal [Member]            
Valuation Allowance [Line Items]            
Income tax refunds received       7.3 $ 59.9  
Net operating loss carryforwards 323.0     323.0    
Tax credit carryforwards 52.0     52.0    
State [Member]            
Valuation Allowance [Line Items]            
Net operating loss carryforwards 83.0     83.0    
Tax credit carryforwards $ 13.0     $ 13.0