Operating Expenses (Schedule of Acquisition Related and Integration Costs) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Total acquisition-related and integration costs	$ 126.2	$ 9.6
SmartEquip
Total acquisition-related and integration costs	0.3	1.2
Euro Auctions
Total acquisition-related and integration costs		6.6
Rouse
Total acquisition-related and integration costs	0.5	$ 1.8
VeriTread
Total acquisition-related and integration costs	0.2
IAA
Financing	30.0
Severance	14.0
Integration	5.1
Acceleration of share-based payments expense	5.0
Legal	9.5
Investment banking, consulting and other acquisition-related costs	61.6
Total acquisition-related and integration costs	$ 125.2