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Borrowings (Details)
$ in Millions
3 Months Ended
Feb. 09, 2016
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
Feb. 08, 2016
USD ($)
Dec. 31, 2015
USD ($)
Long-term borrowings [Abstract]          
Long-term debt   $ 401.2     $ 428.8
Less: current maturities   29.5     29.6
Long-term debt (noncurrent)   $ 371.7     399.2
Senior Notes          
Long-term borrowings [Abstract]          
Debt term   5 years      
Senior Notes | Term Loan due January 2019          
Long-term borrowings [Abstract]          
Long-term debt   $ 276.2     283.8
Line of Credit | Revolving Credit Facility          
Long-term borrowings [Abstract]          
Secured revolving credit facility, maximum borrowing capacity $ 300.0 $ 300.0   $ 350.0  
Debt term   5 years      
Line of Credit | Revolving Credit Facility | Revolving Credit Facility due January 2019          
Long-term borrowings [Abstract]          
Long-term debt   $ 125.0     $ 145.0
Line of Credit | Revolving Credit Facility | Credit Facilities [Member]          
Long-term borrowings [Abstract]          
Debt covenant, debt to EBITDA 45,000,000        
Credit Facilities [Member]          
Long-term borrowings [Abstract]          
Debt covenant, EBITDA to interest ratio   3.25      
Debt covenant, debt to EBITDA   3.25      
Credit Facilities [Member] | Minimum          
Long-term borrowings [Abstract]          
commitment fee percentage   0.20%      
Credit Facilities [Member] | Maximum          
Long-term borrowings [Abstract]          
commitment fee percentage   0.40%      
Credit Facilities [Member] | Weighted Average          
Long-term borrowings [Abstract]          
commitment fee percentage   0.40% 0.30%    
Credit Facilities [Member] | LIBOR          
Long-term borrowings [Abstract]          
Interest rate at period end   2.68% 1.93%    
Credit Facilities [Member] | LIBOR | Minimum          
Long-term borrowings [Abstract]          
Basis spread on variable rate   1.25%      
Credit Facilities [Member] | LIBOR | Maximum          
Long-term borrowings [Abstract]          
Basis spread on variable rate   2.25%