Business Combinations - Contingent Consideration Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Contingent Consideration
Balance at December 31, 2022			$ 17.3
(Decrease) increase in fair value of contingent consideration liabilities			(6.5)
Acquired contingent consideration liabilities			2.9
Payment of contingent consideration			(1.7)
Balance at June 30, 2023	$ 12.0		12.0
SES
Contingent Consideration
Balance at December 31, 2022			16.3
(Decrease) increase in fair value of contingent consideration liabilities	0.4	$ (0.3)	(7.0)	$ (0.8)
Acquired contingent consideration liabilities			0.0
Payment of contingent consideration			0.0
Balance at June 30, 2023	9.3		9.3
BIG
Contingent Consideration
Balance at December 31, 2022			1.0
(Decrease) increase in fair value of contingent consideration liabilities	(0.7)	$ 0.1	0.7	$ (0.2)
Acquired contingent consideration liabilities			0.0
Payment of contingent consideration			(1.7)
Balance at June 30, 2023	0.0		0.0
MP
Contingent Consideration
Balance at December 31, 2022			0.0
(Decrease) increase in fair value of contingent consideration liabilities			(0.2)
Acquired contingent consideration liabilities			2.9
Payment of contingent consideration			0.0
Balance at June 30, 2023	$ 2.7		$ 2.7