Quarterly report pursuant to Section 13 or 15(d)

Debt - Lines of Credit and Other Debt Facilities (Details)

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Debt - Lines of Credit and Other Debt Facilities (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument    
Debt and capital lease obligations $ 1,517,400,000 $ 1,521,000,000.0
Revolving Credit Facility    
Debt Instrument    
Reduction in borrowings 5,500,000 5,300,000
Line of Credit    
Debt Instrument    
Outstanding letters of credit 6,200,000 5,700,000
Line of Credit | Revolving Credit Facility    
Debt Instrument    
Debt and capital lease obligations 0 0
Line of Credit | Lines of Credit and Revolving Lines of Credit    
Debt Instrument    
Debt and capital lease obligations 0 0
Remaining borrowing capacity $ 349,000,000 $ 351,000,000