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Business Combinations (Narrative) (Details) $ / shares in Units, $ in Millions |  |  |  | 9 Months Ended
--- | --- | --- | --- | ---
Mar. 20, 2023 USD ($) | Jan. 22, 2023 USD ($) $ / shares shares | Jan. 03, 2023 USD ($) shares | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Gain on remeasurements of investment upon acquisition |  |  |  | $ 0.0 | $ 1.4
IAA acquisition |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total purchase price | $ 6,646.1 |  |  |  |
Cash consideration per share (usd per share) | $ / shares |  | $ 12.80 |  |  |
Shares issued per share ratio |  | 0.5252 |  |  |
Cash consideration | $ 1,714.2 | $ 1,700.0 |  |  |
Common stock consideration (in shares) | shares |  | 70,300,000 |  |  |
Assumption of net debt |  | $ 1,200.0 |  |  |
Equity award exchange ratio | 0.763139 |  |  |  |
VeriTread |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total purchase price |  |  | $ 32.4 |  |
Cash consideration |  |  | $ 28.1 |  |
Number of shares acquired (in shares) | shares |  |  | 1,056,338 |  |
Cash consideration for additional interest investment |  |  | $ 3.0 |  |
Voting equity interests owned including previous interest, percentage |  |  | 75.00% |  |
Prior holdings of issued and outstanding shares, percent |  |  | 11.00% |  |
Fair value of previously held equity interest |  |  | $ 4.3 |  |
Gain on remeasurements of investment upon acquisition |  |  | $ 1.4 |  |
Remaining units ownership interest, percentage |  |  | 21.00% |  |
Non-controlling interest classified as equity, percentage |  |  | 4.00% |  |
VeriTread | Existing stockholders |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash consideration |  |  | $ 25.1 |  |
Number of shares acquired (in shares) | shares |  |  | 8,889,766 |  |
Senior Notes | IAA acquisition |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Assumption of net debt |  | $ 500.0 |  |  |
Redemption price percentage |  | 102.75% |  |  |

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