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Stockholders' Equity Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Schedule of Capitalization, Equity [Line Items]            
Retained earnings $ 506.6   $ 506.6   $ 486.9  
Noncontrolling interest         $ 0.0  
Net Income (Loss) Attributable to Noncontrolling Interest, Other $ 0.0 $ 0.0 $ 0.0 $ 3.9    
Authorized capitalization of common stock (in shares) 300,000,000   300,000,000   300,000,000  
Par value of common stock (in dollars per share) $ 0.01   $ 0.01      
Authorized capitalization of preferred stock (in shares) 3,500,000   3,500,000      
Par value of preferred stock per share (in dollars per share) $ 0.01   $ 0.01      
Number of shares authorized to be repurchased (in shares) 10,000,000   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 $ 506.6 464.1 506.6 464.1 $ 486.9 $ 353.2
Net Income (Loss) Attributable to Parent     19.7 110.9    
Noncontrolling Interest, Decrease from Deconsolidation       0.0    
Noncontrolling Interest            
Schedule of Capitalization, Equity [Line Items]            
Noncontrolling interest $ 0.0 $ 0.0 0.0 0.0 $ 0.0 $ 6.8
Net Income (Loss) Attributable to Noncontrolling Interest, Other     $ 0.0 3.9    
Noncontrolling Interest, Decrease from Deconsolidation       $ (10.7)