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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Fair Value Disclosures [Abstract] |  |  |  |  |  |  |
Unrealized investment loss (gain) |  |  |  |  | $ 66.4 | $ (43.4) | $ 0.0
Franchise value, impairment | $ 1.9 | $ 4.4 | $ 0.4 |  | 1.9 | 4.4 |
Reductions from impairments |  | $ 3.5 | $ 1.7 |  |  | 3.5 |
Asset impairments |  |  |  | $ 0.5 | $ 1.9 | $ 7.9 | $ 2.6

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