Business Combinations - Additions, Payments, and Net Changes, as well as Interest Expense Accretion on Estimated Acquisition Earn-Out Payables (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Business Combinations [Abstract]
Beginning balance	$ 251.6	$ 291.0
Additions to estimated acquisition earn-out payables	19.6	10.8
Payments for estimated acquisition earn-out payables	(16.1)	(46.9)
Subtotal	255.1	254.9
Net change in earnings from estimated acquisition earn-out payables:
Change in fair value on estimated acquisition earn-out payables	(4.2)	(4.8)
Interest expense accretion	1.9	1.4
Net change in earnings from estimated acquisition earn-out payables	(2.3)	(3.4)
Foreign currency translation adjustments during the year	1.4	(0.6)
Ending balance	$ 254.2	$ 250.9