Significant Accounting Policies and Practices - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) Voting_interest_model_entity Variable_interest_entity Partnership	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Significant Accounting Policies and Practices
Assets related to consolidated VIEs	$ 1,079.9		$ 1,079.9		$ 1,116.2
Liabilities related to consolidated VIEs	838.3		838.3		894.1
Restricted cash and cash equivalents	0.6		$ 0.6		0.2
Number of ownership interest entities | Partnership			31
Investments under the equity method of accounting	13.3		$ 13.3		10.8
Equity earnings in related investments	$ 2.5	$ 0.5	$ 4.0	$ 0.9
ASU 2021-10
Significant Accounting Policies and Practices
Change in accounting principle, accounting standards update, adopted [true false]	true		true
Change in accounting principle, accounting standards update, immaterial effect	true		true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2022		Jan. 01, 2022
ASU 2021-08
Significant Accounting Policies and Practices
Change in accounting principle, accounting standards update, adopted [true false]	true		true
Change in accounting principle, accounting standards update, immaterial effect	true		true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2022		Jan. 01, 2022
Minimum | Equity Investments in Unconsolidated Entities
Significant Accounting Policies and Practices
Ownership interests percentage	30.00%		30.00%
Maximum | Equity Investments in Unconsolidated Entities
Significant Accounting Policies and Practices
Ownership interests percentage	50.00%		50.00%
Primary Beneficiary
Significant Accounting Policies and Practices
Assets related to consolidated VIEs	$ 53.8		$ 53.8		54.9
Liabilities related to consolidated VIEs	$ 49.6		$ 49.6		$ 52.7
Number of ownership interest entities | Variable_interest_entity			25
Not Primary Beneficiary
Significant Accounting Policies and Practices
Number of ownership interest entities | Voting_interest_model_entity			6