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Commitments and Contingencies (Asset Retirement Obligations) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Asset Retirement Obligation [Roll Forward]    
Asset retirement obligations, beginning of period $ 208.2 $ 190.4
Additional accruals 22.0 14.7
Liabilities settled (2.8) (2.1)
Accretion expense 9.5 8.7
Currency translation adjustment 4.5 (3.5)
Asset retirement obligations, end of period $ 241.4 $ 208.2