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Borrowings (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2015
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Borrowings        
Total long-term debt   $ 748.6 $ 749.8  
Total long-term debt, net of current portion   598.7 749.8  
3.75% senior notes due 2022        
Borrowings        
Total long-term debt   $ 349.2 349.1  
Interest rate (as a percent)   3.75%    
Unamortized discount   $ (0.8) (0.9)  
Par value of senior notes   350.0    
3.75% senior notes due 2022 | Significant Observable Inputs (Level 2)        
Borrowings        
Fair value of notes   351.5    
5.125% senior notes due 2020        
Borrowings        
Total long-term debt   $ 249.4 249.3  
Interest rate (as a percent)   5.125%    
Unamortized discount   $ (0.6) (0.7)  
Par value of senior notes   250.0    
5.125% senior notes due 2020 | Significant Observable Inputs (Level 2)        
Borrowings        
Fair value of notes   272.6    
6.125% senior notes due 2016        
Borrowings        
Total long-term debt   149.9 149.8  
Less 6.125% notes due 2016 classified as current   $ (149.9)    
Interest rate (as a percent)   6.125%    
Unamortized discount   $ (0.1) (0.2)  
Par value of senior notes   150.0    
6.125% senior notes due 2016 | Significant Observable Inputs (Level 2)        
Borrowings        
Fair value of notes   154.7    
Revolving credit facility        
Borrowings        
Remaining borrowing capacity   600.0    
Amount outstanding   0.0   $ 0.0
Industrial development and revenue bonds        
Borrowings        
Total long-term debt     1.5  
Repayment of debt $ 1.5      
Other, including capital lease obligations        
Borrowings        
Total long-term debt   0.1 0.1  
Uncommitted line of credit        
Borrowings        
Maximum borrowing capacity   45.0 $ 45.0  
Amount outstanding   $ 0.0   $ 0.0