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Credit Agreements - Additional Information (Details) - USD ($)
3 Months Ended
May 17, 2018
Mar. 31, 2015
Dec. 31, 2019
Sep. 30, 2019
Apr. 03, 2018
Debt Instrument [Line Items]          
Debt, net     $ 819,200,000 $ 819,000,000.0  
Letters of credit outstanding     $ 63,500,000    
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%    
Revolving Credit Facility          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity         $ 850,000,000
Available borrowing capacity     $ 786,500,000    
Senior Term Loan          
Debt Instrument [Line Items]          
Debt, net     274,400,000 274,400,000 $ 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)     3.05%    
Repayments of Debt $ 49,200,000        
Senior Credit Agreement          
Debt Instrument [Line Items]          
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    
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 | Federal Funds Rate          
Debt Instrument [Line Items]          
Interest spread in basis points (as a percent)     0.50%    
Senior Credit Agreement | LIBOR          
Debt Instrument [Line Items]          
Interest spread in basis points (as a percent)     1.00%    
Senior Credit Agreement | Minimum          
Debt Instrument [Line Items]          
Revolving credit facility, unused commitment fee rate (as a percent)     0.125%    
Senior Credit Agreement | Maximum          
Debt Instrument [Line Items]          
Revolving credit facility, unused commitment fee rate (as a percent)     0.275%    
5.375% Senior Notes due March 2025          
Debt Instrument [Line Items]          
Debt, net     $ 248,100,000 248,000,000.0  
Debt issued   $ 250,000,000.0      
Debt instrument interest rate, stated percentage   5.375% 5.375%    
Debt instruments          
Debt instrument, fair value     $ 258,000,000 259,000,000  
4.600% Senior Notes Due May 2028          
Debt Instrument [Line Items]          
Debt, net     $ 296,700,000 296,600,000  
Debt issued $ 300,000,000.0        
Debt instrument interest rate, stated percentage 4.60%   4.60%    
Debt instruments          
Debt instrument, fair value     $ 326,000,000 $ 322,000,000