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Credit Agreements (Details)
1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2018
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
May 15, 2018
Apr. 03, 2018
USD ($)
Long term debt            
Principal     $ 825,000,000 $ 825,000,000    
Debt Issuance Costs, Net     (6,700,000) (7,000,000)    
Debt, Net     818,300,000 818,000,000    
Long term debt net of current maturities     818,300,000 818,000,000    
Revolving line of credit and current maturities of long-term debt     0 0    
Senior Term Loan Member [Member]            
Debt instruments            
Debt Instrument, Fair Value Disclosure     275,000,000 275,000,000    
Debt Instrument, Periodic Payment       49,200,000    
Long term debt            
Principal     275,000,000 275,000,000    
Debt Issuance Costs, Net     (700,000) (800,000)    
Debt, Net     274,300,000 274,200,000   $ 325,000,000
Quarterly principal installment, at commencement     4,100,000      
Payment due at maturity     $ 264,100,000      
Weighted-average interest rate (as a percent)     3.77%      
5.375% Senior Notes due March 2025            
Debt instruments            
Debt Instrument, Fair Value Disclosure     $ 254,000,000 257,000,000    
Long term debt            
Principal     250,000,000 250,000,000    
Debt Issuance Costs, Net     (2,300,000) (2,400,000)    
Debt, Net     $ 247,700,000 $ 247,600,000    
Debt issued   $ 250,000,000        
Debt Instrument, Interest Rate, Stated Percentage     5.375% 5.375% 5.375%  
4.600% Senior notes due May 2028 [Member]            
Debt instruments            
Debt Instrument, Fair Value Disclosure     $ 296,000,000 $ 299,000,000    
Long term debt            
Principal     300,000,000 300,000,000    
Debt Issuance Costs, Net     (3,700,000) (3,800,000)    
Debt, Net     $ 296,300,000 $ 296,200,000    
Debt issued $ 300,000,000          
Debt Instrument, Interest Rate, Stated Percentage     4.60% 4.60% 4.60%  
Revolving Credit Facility            
Long term debt            
Line of Credit Facility, Maximum Borrowing Capacity           $ 850,000,000
Available borrowing capacity     $ 762,300,000      
Senior Credit Agreement Member [Member]            
Long term debt            
Interest spread in basis points (as a percent)     1.25%      
Maximum leverage ratio     3.75      
Minimum interest coverage ratio     2.50      
Debt Instrument, Dividends and Other Distributions Restrictions, Dollar Restriction     $ 1,460,000,000      
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 per the credit agreement 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 per the credit agreement and ending on the last day of the fiscal quarter     100.00%      
Percentage of aggregate net proceeds received by the Company subsequent to the date defined in the credit agreement as a contribution to its common equity or from the issuance and sale of its Common Stock     100.00%      
Senior Credit Agreement Member [Member] | Minimum            
Long term debt            
Revolving credit facility, unused commitment fee rate (as a percent)     0.125%      
Senior Credit Agreement Member [Member] | Maximum            
Long term debt            
Revolving credit facility, unused commitment fee rate (as a percent)     0.275%      
Letter of credit            
Long term debt            
Letters of credit outstanding     $ 87,700,000      
Letter of credit fees percentage on available borrowing capacity, low end of range (as a percent)     0.563%      
Letter of credit fees percentage on available borrowing capacity, high end of range (as a percent)     1.75%      
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%