Fair Value Measurements - Fair Value on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2025	Dec. 31, 2024
Liabilities
Decrease in this balance	$ (5.2)	$ (5.2)
Level 1
Assets
Cash equivalents	550.1	1,139.5
Liabilities
Contingent acquisition obligations	0.0	0.0
Level 2
Assets
Cash equivalents	0.0	0.0
Liabilities
Contingent acquisition obligations	0.0	0.0
Level 3
Assets
Cash equivalents	0.0	0.0
Liabilities
Contingent acquisition obligations	0.3	5.5
Fair Value, Total
Assets
Cash equivalents	550.1	1,139.5
Liabilities
Contingent acquisition obligations	$ 0.3	$ 5.5