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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Tax Credit Carryforward, Amount $ 6.5                 $ 6.5    
Increase (decrease) in deferred tax asset valuation allowance                   (9.1) 413.0  
Deferred income taxes                   (84.7) (0.1) 252.4
Preferred Investors, Aggregate, Investment First Phase 75.0                 75.0    
Provision (benefit) for income taxes (28.7) (18.5) (36.3) (3.0) 8.0 (3.6) (2.1) (3.3)   (86.5) (1.0) 231.8
Other Comprehensive Income (Loss), Tax                   75.0 0 0
Discontinued Operation, Tax Effect of Discontinued Operation                   11.0    
Liability for Uncertain Tax Positions, Noncurrent 2.3       3.0         2.3 3.0 3.7
Unrecognized Tax Benefits, Income Tax Penalties Expense Reduction                 1.0 0.4 0.4 0.3
Income Tax Examination, Penalties and Interest Expense Reduction                   0.2 0.3 0.1
Income Tax Examination, Penalties and Interest Accrued 0.6       0.8         0.6 0.8  
Minimum [Member]
                        
Tax Credit Carryforward, Amount 1.4                 1.4    
Domestic Tax Authority [Member]
                        
Operating Loss Carryforwards 226.5                 226.5    
Deferred income taxes                   (83.0) (0.2) 237.2
State and Local Jurisdiction [Member]
                        
Operating Loss Carryforwards 45.0                 45.0    
Deferred income taxes                   $ (1.7) $ 0.1 $ 15.2