Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Narratives (Details)

v3.3.1.900
Long-Term Debt - Narratives (Details)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2015
USD ($)
Long-Term Debt    
Letters of credit outstanding   $ 55.1
Credit Agreement    
Long-Term Debt    
Interest rate at period end 2.42%  
Minimum fixed charge coverage ratio   1.10
Credit Agreement | Debt Covenants Term Period One    
Long-Term Debt    
Leverage ratio   3.50
Credit Agreement | Debt Covenants Term Period Two    
Long-Term Debt    
Leverage ratio   3.25
Credit Agreement | Debt Covenant Term Period Three    
Long-Term Debt    
Leverage ratio   3.00
Credit Agreement | Adjusted LIBOR Borrowings | Minimum    
Long-Term Debt    
Applicable margin based on total leverage ratio 1.00%  
Leverage ratio used to determine applicable margin on borrowings 1.00  
Credit Agreement | Adjusted LIBOR Borrowings | Maximum    
Long-Term Debt    
Applicable margin based on total leverage ratio 2.00%  
Leverage ratio used to determine applicable margin on borrowings 2.50  
Credit Agreement | Base Rate Borrowings | Minimum    
Long-Term Debt    
Applicable margin based on total leverage ratio 0.00%  
Leverage ratio used to determine applicable margin on borrowings 1.00  
Credit Agreement | Base Rate Borrowings | Maximum    
Long-Term Debt    
Applicable margin based on total leverage ratio 1.00%  
Leverage ratio used to determine applicable margin on borrowings 2.50  
Credit Agreement | Base Rate Borrowings | Federal Funds Open Rate    
Long-Term Debt    
Basis spread 0.50%  
Credit Agreement | Base Rate Borrowings | LIBOR    
Long-Term Debt    
Basis spread 1.00%  
Term Loan Facility    
Long-Term Debt    
Face amount of debt   $ 200.0
Proceeds from issuance of debt   200.0
Amortization of outstanding principal to be paid in quarterly installments, expressed as a percentage, year one 5.00%  
Amortization of outstanding principal to be paid in quarterly installments, expressed as a percentage, year two through year four 10.00%  
Amortization of outstanding principal to be paid in quarterly installments, expressed as a percentage, year five 15.00%  
Revolving Facility    
Long-Term Debt    
Maximum borrowing capacity   125.0
Additional borrowing capacity available, subject to certain conditions   100.0
Sublimit available for issuance of letters of credit   100.0
Sublimit available for swingline loans   $ 15.0