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Summary of Significant Accounting Policies - Reconciliation of the total cash, cash equivalents and restricted cash (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Accounting Policies [Abstract]        
Cash and cash equivalents $ 447.1 $ 452.6 $ 558.4 $ 502.8
Restricted cash 63.7 9.6 10.3 15.6
Cash, cash equivalents and restricted cash $ 510.8 $ 462.2 $ 568.7 $ 518.4