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Temporary Equity, Equity and Dividends (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 20, 2023 | Mar. 07, 2023 | Feb. 01, 2023 | Jan. 22, 2023 | Jan. 03, 2023 | Aug. 02, 2023 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, unlimited shares authorized |  |  |  |  |  |  |  |  | Unlimited |  | Unlimited
Issuance of common stock |  |  |  |  |  |  |  |  | $ 15.0 |  |
Dividend paid |  |  |  |  |  |  |  |  | 13.4 |  |
Gain (Loss) from intra-entity foreign currency transactions |  |  |  |  |  |  | $ (0.7) | $ (8.6) | $ 0.6 | $ (9.4) |
Special Dividend [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends declared (USD per share) |  | $ 1.08 |  |  |  |  |  |  | $ 1.08 |  |
Preferential Dividends |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, dividends |  |  |  |  |  |  | 6.7 |  | $ 10.9 |  |
Dividend paid |  |  |  |  |  |  |  |  | 9.8 |  |
Dividends accrued and unpaid |  |  |  |  |  |  | 1.1 |  | 1.1 |  |
Participating Dividends |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, dividends |  |  |  |  |  |  | 1.8 |  | 3.6 |  |
Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Initial conversion price |  |  | $ 73.00 |  |  |  |  |  |  |  |
Starboard Value LP and certain of its affiliates | Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  | $ 15.0 |  |  |  |  |  |  |  |
Shares issued for business combination [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share capital from additional paid-in capital |  |  |  |  |  |  | 0.3 | 1.8 | 0.3 | 1.8 |
Unrecognized share based continuing employment costs |  |  |  |  |  |  | $ 1.7 | $ 6.5 | $ 1.7 | $ 6.5 |
Unrecognized share based continuing employment costs, weighted average period for recognition |  |  |  |  |  |  |  |  | 9 months 18 days |  |
VeriTread |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest, percentage |  |  |  |  | 4.00% |  |  |  |  |  |
Series A Senior Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Temporary equity, authorized shares |  |  |  |  |  |  | 485,000,000 |  | 485,000,000 |  |
Issuance of redeemable convertible preferred stock |  |  |  |  |  |  |  |  | $ 482.0 |  |
Series A Senior Preferred Shares [Member] | Starboard Value LP and certain of its affiliates | Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of redeemable convertible preferred stock |  |  | $ 485.0 |  |  |  |  |  |  |  |
Initial preferred dividend, percentage |  |  | 5.50% |  |  |  |  |  |  |  |
Participating dividends |  |  | $ 0.27 |  |  |  |  |  |  |  |
Increase in preferred dividend rate in fourth anniversary, percentage |  |  | 7.50% |  |  |  |  |  |  |  |
Spread on variable rate, percentage |  |  | 6.00% |  |  |  |  |  |  |  |
Increase in preferred dividend rate in ninth anniversary, percentage |  |  | 10.50% |  |  |  |  |  |  |  |
Notice term for redemption of preferred shares |  |  | 45 days |  |  |  |  |  |  |  |
Redemption price, percentage |  |  | 100.00% |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends declared (USD per share) |  |  |  |  |  | $ 0.27 |  |  |  |  |
Dividends payable date |  |  |  |  |  | Sep. 13, 2023 |  |  |  |  |
Dividends, date of record |  |  |  |  |  | Aug. 23, 2023 |  |  |  |  |
IAA, Inc [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash consideration | $ 1,714.2 |  |  | $ 1,700.0 |  |  |  |  |  |  |
VeriTread |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Prior holdings of issued and outstanding shares, percent |  |  |  |  | 11.00% |  |  |  |  |  |
Voting equity interests owned including previous interest, percentage |  |  |  |  | 75.00% |  |  |  |  |  |
Cash consideration |  |  |  |  | $ 28.1 |  |  |  |  |  |
Remaining units ownership interest, percentage |  |  |  |  | 21.00% |  |  |  |  |  |

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