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Business Combinations (Narrative) (Details) £ in Millions |  |  |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 20, 2023 USD ($) | Jan. 22, 2023 USD ($) shares | Jan. 03, 2023 USD ($) shares | May 04, 2022 | Aug. 09, 2021 USD ($) | Aug. 09, 2021 GBP (£) | Jun. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2022 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain on remeasurements of investment upon acquisition |  |  |  |  |  |  |  |  |  | $ 1,400,000 |  |
Operating lease right-of-use assets |  |  |  |  |  |  | $ 1,411,300,000 | $ 1,411,300,000 |  | 1,411,300,000 |  | $ 123,000,000.0
Property, plant and equipment |  |  |  |  |  |  | 1,137,900,000 | 1,137,900,000 |  | 1,137,900,000 |  | 459,100,000
Intangible assets |  |  |  |  |  |  | 2,734,600,000 | 2,734,600,000 |  | 2,734,600,000 |  | 322,700,000
Deferred tax liabilities |  |  |  |  |  |  | 668,600,000 | 668,600,000 |  | 668,600,000 |  | 54,000,000.0
Goodwill |  |  |  |  |  |  | 4,705,200,000 | 4,705,200,000 |  | 4,705,200,000 |  | $ 948,800,000
Depreciation |  |  |  |  |  |  | 25,500,000 |  | $ 7,900,000 | 37,000,000.0 | $ 15,600,000 |
Amortization |  |  |  |  |  |  | 84,100,000 |  | $ 16,400,000 | $ 108,800,000 | 32,900,000 |
IAA |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price | $ 6,646,200,000 |  |  |  |  |  |  |  |  |  |  |
Cash consideration per share |  | $ 12.80 |  |  |  |  |  |  |  |  |  |
Shares issued per share | shares |  | 0.5252 |  |  |  |  |  |  |  |  |  |
Cash consideration | $ 1,714,200,000 | $ 1,700,000,000 |  |  |  |  |  |  |  |  |  |
Common stock consideration (in shares) | shares |  | 70,300,000 |  |  |  |  |  |  |  |  |  |
Assumption of net debt |  | $ 1,200,000,000 |  |  |  |  |  |  |  |  |  |
Fair value measurement period of certain assets and liabilities, maximum | 1 year |  |  |  |  |  |  |  |  |  |  |
Acquiree's revenue |  |  |  |  |  |  | 560,400,000 | 640,400,000 |  |  |  |
Acquiree's net income |  |  |  |  |  |  | $ 74,000,000.0 | $ 76,900,000 |  |  |  |
Acquisition-related costs |  |  |  |  |  |  |  |  |  |  | 218,700,000 |
Pre-acquisition transaction costs |  |  |  |  |  |  |  |  |  |  | $ 60,000,000.0 |
Equity award exchange ratio | 0.763139 |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 3,716,800,000 |  |  |  |  |  |  |  |  |  |  |
VeriTread |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares acquired | shares |  |  | 1,056,338 |  |  |  |  |  |  |  |  |
Total purchase price |  |  | $ 32,400,000 |  |  |  |  |  |  |  |  |
Cash consideration |  |  | 28,100,000 |  |  |  |  |  |  |  |  |
Cash consideration for additional interest investment |  |  | $ 3,000,000.0 |  |  |  |  |  |  |  |  |
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 interest |  |  | $ 4,300,000 |  |  |  |  |  |  |  |  |
Gain on remeasurements of investment upon acquisition |  |  | $ 1,400,000 |  |  |  |  |  |  |  |  |
Remaining units ownership interest, percentage |  |  | 21.00% |  |  |  |  |  |  |  |  |
Non-controlling interest classified as equity, percentage |  |  | 4.00% |  |  |  |  |  |  |  |  |
Fair value measurement period of certain assets and liabilities, maximum |  |  | 1 year |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 25,200,000 |  |  |  |  |  |  |  |  |
VeriTread | Existing stockholders |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares acquired | shares |  |  | 8,889,766 |  |  |  |  |  |  |  |  |
Cash consideration |  |  | $ 25,200,000 |  |  |  |  |  |  |  |  |
Euro Auctions Limited |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration under the terms of the SPA, to be paid on closing |  |  |  |  | $ 1,020,000,000.00 | £ 775.0 |  |  |  |  |  |
2021 USD Notes |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  |  | 100.00% |  |  |  |  |  |  |  |
Senior Notes [Member] | IAA |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Assumption of net debt |  | $ 500,000,000.0 |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  | 102.75% |  |  |  |  |  |  |  |  |  |

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