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Stock Based Compensation Plan (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Weighted-Average Award Price [Roll Forward]    
Period of restrictions over awards 4 years  
Compensation expense $ 0.9 $ 0.8
Total compensation cost related to unvested equity awards 7.0  
Weighted-average period of recognition of cost 2 years 8 months 12 days  
Restricted Stock Award [Member]
   
Shares or Units and Rights [Roll Forward]    
Outstanding, beginning balance (in shares) 437,000  
Granted (in shares) 138,565  
Forfeited (in shares) (3,850)  
Outstanding, ending balance (in shares) 571,715  
Exercisable, ending balance (in shares) 0  
Weighted-Average Award Price [Roll Forward]    
Outstanding, beginning balance (in dollars per share) $ 14.46  
Granted (in dollars per share) $ 28.92  
Forfeited (in dollars per share) $ 20.80  
Outstanding, ending balance (in dollars per share) $ 17.92  
Exercisable, ending balance (in dollars per share) $ 0  
Vesting period 3 years  
Aggregate intrinsic value of outstanding awards 17.0  
Stock-Settled Appreciation Rights [Member]
   
Shares or Units and Rights [Roll Forward]    
Outstanding, beginning balance (in shares) 149,700  
Granted (in shares) 0  
Forfeited (in shares) 0  
Outstanding, ending balance (in shares) 149,700  
Exercisable, ending balance (in shares) 37,700  
Weighted-Average Award Price [Roll Forward]    
Outstanding, beginning balance (in dollars per share) $ 15.78  
Outstanding, ending balance (in dollars per share) $ 15.78  
Exercisable, ending balance (in dollars per share) $ 8.76  
Aggregate intrinsic value of outstanding awards 2.1  
Aggregate intrinsic value of vested awards $ 0.8  
Performance Shares [Member]
   
Shares or Units and Rights [Roll Forward]    
Granted (in shares) 39,890