Employee Incentive Plans - Amounts Recognized in Consolidated Financial Statements (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allocation
Compensation expense	$ 25.3	$ 28.4	$ 39.4
Amount of related income tax benefit recognized in net income	5.9	6.7	9.1
Unit-based compensation, related income tax expense (benefit)	3.1	6.0	2.2
Unvested restricted units
Allocation
Unit-based compensation, related income tax expense (benefit)	3.1	6.0	2.2
Non-Controlling Interest
Allocation
Compensation expense	0.0	0.0	0.5
Cost of unit-based compensation charged to general and administrative expense
Allocation
Compensation expense	18.7	21.3	32.7
Cost of unit-based compensation charged to operating expense
Allocation
Compensation expense	$ 6.6	$ 7.1	$ 6.7

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

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