Operating Expenses (Schedule of Acquisition Related and Integration Costs) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Business Acquisition [Line Items]
Total acquisition-related and integration costs	$ 23.1		$ 2.0	$ 195.6	$ 15.1
IAA
Business Acquisition [Line Items]
Financing	0.0		0.0	30.0	0.0
Severance	6.6		0.0	29.3	0.0
Integration	11.7		0.0	28.8	0.0
Acceleration of share-based payments expense	0.6		0.0	6.5	0.0
Legal	0.1		0.0	12.2	0.0
Investment banking, consulting and other acquisition-related costs	2.9		0.0	67.2	0.0
Settlement of pre-existing contractual arrangement	0.0			16.3
Total acquisition-related and integration costs	21.9		0.0	190.3	0.0
Settled a pre-existing contractual arrangement		$ 20.0
Extinguished accrued liabilities recognized on the balance sheet at acquisition		3.7
Integration costs recognized		$ 16.3
Other acquisitions
Business Acquisition [Line Items]
Total acquisition-related and integration costs	$ 1.2		$ 2.0	$ 5.3	$ 15.1