Employee Incentive Plans - Amounts Recognized in Consolidated Financial Statements (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Allocation
Compensation expense	$ 30.4	$ 25.3	$ 28.4
Amount of related income tax benefit recognized in net income	7.1	5.9	6.7
Unit-based compensation, related income tax expense (benefit)	(0.7)	3.1	6.0
Unvested restricted units
Allocation
Unit-based compensation, related income tax expense (benefit)	(0.7)	3.1	6.0
Cost of unit-based compensation charged to operating expense
Allocation
Compensation expense	5.7	6.6	7.1
Cost of unit-based compensation charged to general and administrative expense
Allocation
Compensation expense	$ 24.7	$ 18.7	$ 21.3

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 740
-Section 35
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=126970579&loc=d3e23163-113944

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