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Credit Agreements (Details)
1 Months Ended 3 Months Ended
Mar. 31, 2015
USD ($)
Feb. 28, 2014
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jan. 31, 2015
USD ($)
Mar. 21, 2014
USD ($)
Long term debt            
Principal     $ 830,000,000 $ 835,000,000    
Debt Issuance Costs     (6,600,000) (7,100,000)    
Debt, Net     823,400,000 827,900,000    
Long term debt net of current maturities     803,400,000 807,900,000    
Other Short-term Borrowings     9,700,000 3,000,000    
Current maturities of long-term debt     (20,000,000) (20,000,000)    
Revolving line of credit and current maturities of long-term debt     $ 29,700,000 23,000,000    
Credit agreement            
Long term debt            
Interest spread in basis points (as a percent)     1.50%      
Maximum leverage ratio     4.50      
Minimum interest coverage ratio     2.50      
Maximum senior secured leverage ratio     3.00      
Debt instrument, covenant terms, senior secured leverage ratio without collateral     3.75      
Dividend payment restriction under credit agreement            
Percentage of consolidated net income of the Company and its subsidiaries accrued on a cumulative basis during the period beginning on January 1, 2010 and ending on the last day of the fiscal quarter     50.00%      
Percentage of consolidated net deficit of the Company and its subsidiaries accrued on a cumulative basis during the period beginning on January 1, 2010 and ending on the last day of the fiscal quarter     100.00%      
Percentage of aggregate net proceeds received by the Company subsequent to March 3, 2010 as a contribution to its common equity or from the issuance and sale of its Common Stock     100.00%      
Credit agreement | Minimum            
Long term debt            
Revolving credit facility, unused commitment fee rate (as a percent)     0.225%      
Credit agreement | Maximum            
Long term debt            
Revolving credit facility, unused commitment fee rate (as a percent)     0.35%      
Senior Secured Term Loan            
Long term debt            
Principal     $ 330,000,000 335,000,000    
Debt Issuance Costs     (700,000) (800,000)    
Debt, Net     329,300,000 $ 334,200,000   $ 400,000,000
Quarterly principal installment, at commencement     5,000,000      
Payment due at maturity     $ 310,000,000      
Weighted-average interest rate (as a percent)     2.85%      
Revolving credit facility            
Long term debt            
Maximum borrowing capacity         $ 850,000,000 $ 600,000,000
Available borrowing capacity     $ 755,100,000      
5.375% Senior Notes due March 2022            
Long term debt            
Debt instrument interest rate (as a percent)   5.375% 5.375% 5.375%    
Principal     $ 250,000,000 $ 250,000,000    
Debt Issuance Costs     (3,300,000) (3,500,000)    
Debt, Net     246,700,000 246,500,000    
Dividend payment restriction under credit agreement            
Debt issued   $ 250,000,000        
Fair value of debt     $ 257,000,000 $ 260,000,000    
5.375% Senior Notes due March 2025            
Long term debt            
Debt instrument interest rate (as a percent) 5.375%   5.375% 5.375%    
Principal     $ 250,000,000 $ 250,000,000    
Debt Issuance Costs     (2,600,000) (2,800,000)    
Debt, Net     247,400,000 247,200,000    
Dividend payment restriction under credit agreement            
Debt issued $ 250,000,000          
Fair value of debt     264,000,000 $ 264,000,000    
Letter of credit            
Long term debt            
Letters of credit outstanding     $ 94,900,000      
Letter of credit fees percentage on available borrowing capacity, low end of range (as a percent)     0.625%      
Letter of credit fees percentage on available borrowing capacity, high end of range (as a percent)     2.00%      
Credit agreement - dollar-denominated loans | Federal funds rate            
Long term debt            
Interest spread in basis points (as a percent)     0.50%      
Credit agreement - dollar-denominated loans | LIBOR            
Long term debt            
Interest spread in basis points (as a percent)     1.00%