Acquisitions Cash Paid for Acquisitions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash Paid for Acquisitions [Abstract]
Cost of investment: current-year acquisitions	$ 235.4	$ 0.0	$ 8.5
Cost of investment: prior-year acquisitions	9.3	28.0	45.9
Less: net cash acquired	(3.2)	0.0	(2.9)
Total cost of investment	241.5	28.0	51.5
Operating payments	9.6	39.1	2.9
Total cash paid for acquisitions	251.1	67.1	54.4
Acquisitions, net of cash acquired	232.2	0.0	4.9
Payments for previous acquisition, financing cash flows	9.3	28.0	$ 46.6
Acquired finite-lived intangible assets related to acquisitions	$ 62.0	$ 2.0