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Debt - Effective Interest Rate (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Debt        
Effective interest rate including effects of interest rate swap agreements     4.7% 4.7%
Amortization of deferred debt issuance costs $ 2.4 $ 9.8 $ 4.8 $ 12.6