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Commitments and Contingencies (Details)
$ in Millions
3 Months Ended
Dec. 31, 2020
USD ($)
Commitments and Contingencies  
Co-investment commitments in partnership $ 122.2
Payments for Achievement of Financial Targets  
Contingent payments due  
2022 37.5
2023 - 2025 77.5
Expected payments 13.0
Payment contingent on not meeting financial targets (up to) 12.5
Payment contingent on exercise of option to reduce ownership percentage 25.0
Equity Method Investee  
Contingent payments due  
2022 $ 37.5
Equity Method Investee | Undisclosed Affiliate  
Contingent payments due  
Ownership percentage held by minority interest in affiliated 14.00%
Noncontrolling interest, sale of ownership percentage 5.00%