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Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Debt    
Total debt $ 2,090,100 $ 2,085,000
Less: Current portion of debt and short-term borrowings (24,300) (20,900)
Less: Unamortized debt issuance costs (21,400) (23,000)
Long-term debt 2,044,358 2,041,136
2014 Credit Agreement    
Debt    
Total debt 247,000 248,500
2024 Senior Notes    
Debt    
Total debt 797,300 797,300
2017 Senior Notes    
Debt    
Total debt 997,300 997,300
Other Debt    
Debt    
Total debt $ 48,500 $ 41,900