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, 2021
Dec. 31, 2020
Debt Instrument    
Total debt and capital lease obligations $ 1,910,300,000 $ 1,515,500,000
Revolving Credit Facility    
Debt Instrument    
Reduction in borrowings 5,500,000 5,500,000
Line of Credit    
Debt Instrument    
Outstanding letters of credit 5,900,000 6,200,000
Line of Credit | Lines of Credit and Revolving Lines of Credit    
Debt Instrument    
Total debt and capital lease obligations 0 0
Remaining borrowing capacity $ 352,000,000 $ 349,000,000