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Stockholders' Equity Stockholders' Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Schedule of Capitalization, Equity [Line Items]        
Retained earnings $ 344.4   $ 353.2  
Noncontrolling interest 0   6.8  
Net Income (Loss) Attributable to Noncontrolling Interest, Other 3.9 (2.3)    
Authorized capitalization of common stock (in shares) 300,000,000   300,000,000  
Par value of common stock (in dollars per share) $ 0.01      
Authorized capitalization of preferred stock (in shares) 3,500,000      
Par value of preferred stock per share (in dollars per share) $ 0.01      
Number of shares authorized to be repurchased (in shares) 10,000,000      
Aggregate number of shares repurchased (in shares) 7,600,000      
Aggregate cost of shares repurchased 49.8      
Retained Earnings
        
Schedule of Capitalization, Equity [Line Items]        
Retained earnings 344.4 232.5 353.2 222.1
Net Income (Loss) Attributable to Parent (8.8) 10.4    
Noncontrolling Interest, Decrease from Deconsolidation         
Noncontrolling Interest
        
Schedule of Capitalization, Equity [Line Items]        
Noncontrolling interest 0 (21.3) 6.8 (19.0)
Net Income (Loss) Attributable to Noncontrolling Interest, Other 3.9 (2.3)    
Noncontrolling Interest, Decrease from Deconsolidation $ (10.7)