Segment and Related Information - Reconciliation of Segment Income to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment and Related Information [Abstract]
Income from operations			$ 47.4	$ 286.5	$ 171.8
Interest expense, net			(54.5)	(56.4)	(59.2)
Other non-operating deductions, net			(6.9)	(4.7)	(4.9)
Provision for litigation accrual and credit losses	$ 215.0		215.0	30.0	0.0
Restructuring and other items			15.0	0.0	6.9
Acquisition-related expenses			0.0	0.0	0.3
Litigation expenses			19.6	11.3	29.2
Debt extinguishment expenses		$ (1.8)	0.0	(1.8)	0.0
Income (loss) before tax and equity in earnings			(14.0)	223.6	107.7
Operating Segments [Member]
Segment and Related Information [Abstract]
Income from operations			293.9	339.5	189.4
Reconciling Item [Member]
Segment and Related Information [Abstract]
Interest expense, net			(54.5)	(56.4)	(59.2)
Other non-operating deductions, net			(6.9)	(4.7)	(4.9)
Provision for litigation accrual and credit losses			215.0	30.0	0.0
Restructuring and other items			2.2	0.0	2.8
Acquisition-related expenses			0.0	0.0	0.3
Litigation expenses			19.6	11.3	2.4
Unallocated corporate expenses			9.7	11.7	12.1
Debt extinguishment expenses			$ 0.0	$ (1.8)	$ 0.0