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Intangible Assets, net (Tables) | 12 Months Ended
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Dec. 31, 2021
Intangible Assets, net |
Summary of intangible assets, net | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | December 31, 2021 | ​ | December 31, 2020
​ | Weighted Average | ​ | Gross | ​ | ​ | ​ | ​ | Gross | ​ | ​ | ​
​ | Amortizable | ​ | Carrying | ​ | Accumulated | ​ | Carrying | ​ | Accumulated
​ | Life in Years |  | Amount |  | Amortization |  | Amount |  | Amortization
​ | ​ | ​ | (in millions)
Intangible assets subject to amortization: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Covenants not to compete | 5.0 | ​ | $ | 0.5 | ​ | $ | (0.2) | ​ | $ | 0.7 | ​ | $ | (0.5)
Customer lists/relationships | 14.3 | ​ | ​ | 713.0 | ​ | ​ | (435.1) | ​ | ​ | 623.2 | ​ | ​ | (396.7)
Other | 8.5 | ​ | ​ | 25.2 | ​ | ​ | (9.4) | ​ | ​ | 9.2 | ​ | ​ | (9.0)
​ | ​ | ​ | ​ | 738.7 | ​ | ​ | (444.7) | ​ | ​ | 633.1 | ​ | ​ | (406.2)
Intangible assets not subject to amortization: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Trade names | ​ | ​ | ​ | 783.7 | ​ | ​ | — | ​ | ​ | 720.2 | ​ | ​ | —
​ | ​ | ​ | $ | 1,522.4 | ​ | $ | (444.7) | ​ | $ | 1,353.3 | ​ | $ | (406.2)
Summary of estimated aggregate amortization expense | ​
​ | ​ | ​
​ | (in millions)
2022 | ​ | 46.8
2023 | ​ | 42.6
2024 | ​ | 39.1
2025 | ​ | 34.9
2026 | ​ | 25.4

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