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Stockholders' Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Schedule of Capitalization, Equity [Line Items]        
Retained earnings $ 343.0   $ 222.1  
Noncontrolling interest (26.7)   (19.0)  
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 343.0 198.2 222.1 131.0
Net Income (Loss) Attributable to Parent 120.9 67.2    
Noncontrolling Interest
        
Schedule of Capitalization, Equity [Line Items]        
Noncontrolling interest (26.7) (16.6) (19.0) (9.9)
Net Income (Loss) Attributable to Noncontrolling Interest, Other $ (7.7) $ (6.7)