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Incentive Plan - Schedule of Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Long-term incentive units |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Deferred compensation, expensed | $ 5.2 | $ 4.2 |
Deferred compensation, capitalized |  | 0.1 |
Unearned Compensation | $ 38.4 |  | $ 19.8
Expected period to recognize unearned compensation (in years) | 2 years 6 months |  |
Market-based performance awards |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Deferred compensation, expensed | $ 5.0 | 6.2 |
Deferred compensation, capitalized | 0.2 | 0.4 |
Unearned Compensation | $ 54.4 |  | 39.2
Expected period to recognize unearned compensation (in years) | 2 years 7 months 6 days |  |
Interxion awards |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Deferred compensation, expensed | $ 0.9 | 10.5 |
Unearned Compensation | $ 5.9 |  | 8.5
Expected period to recognize unearned compensation (in years) | 1 year 3 months 18 days |  |
Restricted Stock Units |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Deferred compensation, expensed | $ 5.3 | 6.0 |
Deferred compensation, capitalized | 1.0 | $ 0.7 |
Unearned Compensation | $ 75.6 |  | $ 44.5
Expected period to recognize unearned compensation (in years) | 3 years |  |

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