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Incentive Plans - Schedule of Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Long-term incentive units |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |
Deferred compensation, expensed | $ 3.7 | $ 5.1 | $ 10.1 | $ 16.7 |
Deferred compensation, capitalized | 0.1 |  | 0.1 | 0.1 |
Unearned Compensation | 21.1 |  | $ 21.1 |  | $ 20.7
Expected period to recognize unearned compensation (in years) |  |  | 2 years 3 months 18 days |  |
Market-based performance awards |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |
Deferred compensation, expensed | 3.1 | 5.5 | $ 8.6 | 16.1 |
Deferred compensation, capitalized | 0.1 | 0.2 | 0.2 | 0.4 |
Unearned Compensation | 25.0 |  | $ 25.0 |  | 30.3
Expected period to recognize unearned compensation (in years) |  |  | 2 years 3 months 18 days |  |
Service Based Restricted Stock Units |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |
Deferred compensation, expensed | 8.2 | 6.7 | $ 24.1 | 18.9 |
Deferred compensation, capitalized | 1.8 | 0.9 | 4.4 | 3.7 |
Unearned Compensation | 74.2 |  | $ 74.2 |  | 55.4
Expected period to recognize unearned compensation (in years) |  |  | 2 years 8 months 12 days |  |
Interxion awards |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |
Deferred compensation, expensed | 0.3 | $ 1.6 | $ 1.6 | $ 3.7 |
Deferred compensation, capitalized |  |  | 0.1 |  |
Unearned Compensation | $ 0.2 |  | $ 0.2 |  | $ 1.9
Expected period to recognize unearned compensation (in years) |  |  | 3 months 18 days |  |

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