Strategic Transformation, Restructuring and Other Asset Gains, net - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended			9 Months Ended
	Oct. 31, 2024	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Restructuring charges:
Hosting arrangement, service contract, implementation cost, capitalized, after accumulated amortization		$ 29.1			$ 29.1		$ 31.9
Hosting arrangement, service contract, implementation cost, capitalized, accumulated amortization		8.3			8.3		5.5
Settlement, amount	$ 8.4
Workforce reductions		0.0	$ 0.0		0.0	$ 0.9
Other Restructuring
Restructuring charges:
Workforce reductions				$ 0.9
Prepaid expenses and other assets
Restructuring charges:
Hosting arrangement, service contract, implementation cost, capitalized, after accumulated amortization		3.7			3.7		3.7
Other long-term assets
Restructuring charges:
Hosting arrangement, service contract, implementation cost, capitalized, after accumulated amortization		$ 25.4			$ 25.4		$ 28.2