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Fair Value Measurements - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Jun. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) authorization | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Payments to acquire equity method investments |  |  |  | $ 62.8 | $ 16.5 |  |
Unfunded commitments | $ 6.8 |  |  | $ 6.8 |  |  |
Unfunded commitments term |  |  |  | 10 years |  |  |
Debt securities, held-to-maturity, restricted | 77.5 |  |  | $ 77.5 |  | $ 76.1 |
Held-to-maturity, allowance for credit loss | 0.6 |  |  | 0.6 |  | 0.5 |
Restricted investment, restricted cash | 6.4 |  |  | 6.4 |  | 4.7 |
Restricted investments, at fair value | 73.5 |  |  | 73.5 |  | 80.0 |
Total debt including finance lease obligations | 1,160.8 |  |  | $ 1,160.8 |  | $ 1,280.5 |
Earn out period |  |  |  | 5 years |  | 5 years |
Privately Held Companies |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Number of strategic investments acquired | authorization |  |  |  | 2 |  |  |
Payments to acquire equity method investments | 60.0 | $ 2.0 |  |  |  |  |
Equity securities where fair value is not readily determinable | 80.8 |  |  | $ 80.8 |  | $ 18.8 |
Privately Held Company |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Payments to acquire equity method investments |  |  | $ 16.5 |  |  |  |
Carrying value of strategic equity investment | 14.5 |  |  | 14.5 |  | 16.5 |
Venture Capital Fund |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Payments to acquire equity method investments | 0.8 |  |  |  |  |  |
Carrying value of strategic equity investment | 0.8 |  |  | 0.8 |  |  |
2020 Acquisitions |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  | $ 7.0
Liability |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Revenue Earn-out consideration | 0.8 |  |  | 0.8 |  | 0.8 | $ 0.8
Debt Obligations |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Finance lease obligations | 101.8 |  |  | 101.8 |  | 102.4 |
Variable Interest Rate |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Total debt including finance lease obligations | 509.0 |  |  | 509.0 |  | 328.1 |
Senior Notes Issued 2018 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Senior notes | 550.0 |  |  | 550.0 |  | 850.0 |
Senior Notes Issued 2018 | Level 2 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Debt instrument, fair value | 452.4 |  |  | 452.4 |  | 843.9 |
Estimate of Fair Value Measurement | Debt Obligations |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Finance lease obligations | $ 107.1 |  |  | $ 107.1 |  | $ 118.6 |

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