Acquisitions and Divestitures (Schedule of Purchase Price Allocation) (Details) - USD ($) $ in Millions	Jul. 14, 2025	Mar. 20, 2023	Jan. 22, 2023	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Liabilities assumed:
Goodwill acquired on acquisition				$ 4,668.0	$ 4,511.8	$ 4,537.0
JM Wood Auction Co Inc
Business Combination [Line Items]
Purchase price	$ 213.6
Assets acquired:
Cash and cash equivalents	6.4
Inventory	8.2
Property, plant and equipment	4.0
Intangible assets	49.9
Liabilities assumed:
Other, net	(0.7)
Fair value of identifiable net assets acquired	67.8
Goodwill acquired on acquisition	$ 145.8
IAA
Business Combination [Line Items]
Purchase consideration		$ 1,714.2	$ 1,700.0
Fair value of common shares issued		3,712.9
Repayment of net debt		1,157.1
Reimbursement of costs		48.8
Fair value of exchanged equity awards		13.1
Purchase price		6,646.1
Assets acquired:
Cash and cash equivalents		166.6
Trade and other receivables		497.3
Inventory		57.1
Other current assets		28.0
Income taxes receivable		0.6
Property, plant and equipment		618.5
Operating lease right-of-use assets		1,289.7
Other non-current assets		34.8
Intangible assets		2,712.1
Liabilities assumed:
Auction proceeds payable		60.7
Trade and other liabilities		257.0
Current operating lease liability		77.5
Income taxes payable		3.5
Long-term operating lease liability		1,192.7
Other non-current liabilities		24.3
Deferred tax liabilities		689.5
Fair value of identifiable net assets acquired		3,099.5
Goodwill acquired on acquisition		$ 3,546.6