Business Combinations - Contingent Consideration Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Contingent Consideration
Beginning balance	$ 17.3
(Decrease) increase in fair value of contingent consideration liabilities	(8.7)
Acquired contingent consideration liabilities	2.9
Payment of contingent consideration	(4.4)
Ending balance	7.1	$ 17.3
SES
Contingent Consideration
Beginning balance	16.3
(Decrease) increase in fair value of contingent consideration liabilities	(9.2)	2.8	$ 2.2
Acquired contingent consideration liabilities	0.0
Payment of contingent consideration	0.0
Ending balance	7.1	16.3
SES | Minimum
Contingent Consideration
Ending balance	0.0
Business combination, potential payout on consideration liability	0.0
SES | Maximum
Contingent Consideration
Ending balance	12.5
Business combination, potential payout on consideration liability	12.5
BIG
Contingent Consideration
Beginning balance	1.0
(Decrease) increase in fair value of contingent consideration liabilities	0.7	1.1	$ (1.1)
Acquired contingent consideration liabilities	0.0
Payment of contingent consideration	(1.7)
Ending balance	0.0	1.0
MP
Contingent Consideration
Beginning balance	0.0
(Decrease) increase in fair value of contingent consideration liabilities	(0.2)
Acquired contingent consideration liabilities	2.9
Payment of contingent consideration	(2.7)
Ending balance	$ 0.0	$ 0.0