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Fair Value of Financial Instruments - Carrying Value and Fair Value of Other Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Nov. 20, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, net $ 1,065.7 $ 996.5  
Lease financing arrangements 141.9 150.0  
Carrying Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Lease financing arrangements 0.0 1.5  
Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Lease financing arrangements 0.0 1.2  
Revolving credit facility      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Revolving credit facility 55.0 235.0  
Revolving credit facility | Carrying Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Revolving credit facility 605.0 535.0  
Revolving credit facility | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Revolving credit facility $ 605.0 $ 535.0  
6.375% senior notes due 2022, including bond premium      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Stated interest rate 6.375% 6.375% 6.375%
Senior Notes | 6.375% senior notes due 2022, including bond premium      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, net $ 477.4 $ 477.6  
Stated interest rate 6.375% 6.375%  
Senior Notes | 6.375% senior notes due 2022, including bond premium | Carrying Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, net $ 477.4 $ 477.6  
Senior Notes | 6.375% senior notes due 2022, including bond premium | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, net $ 506.3 $ 493.8