Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Summary of Segment Information
Total revenue	$ 939.7	$ 922.2	$ 1,835.1	$ 1,780.3
Operating profit (loss)	70.7	(3.9)	94.5	(6.0)
Impairment of assets	0.0	(1.8)	0.0	(2.7)
Restructuring and transformation expenses	(10.6)	(18.6)	(47.3)	(33.6)
Other income (expense)	(25.4)	(697.6)	(63.4)	(785.8)
Profit (loss) before taxes	45.3	(701.5)	31.1	(791.8)
Operating Segments
Summary of Segment Information
Operating profit (loss)	169.3	134.5	321.3	253.4
Segment Reconciling Items
Summary of Segment Information
Total revenue	0.0	4.9	0.0	9.7
Operating profit (loss)	0.0	(2.9)	0.0	(6.6)
Impairment of assets	0.0	(1.8)	0.0	(2.7)
Amortization of fair value assets	(17.7)	(18.0)	(40.8)	(35.7)
Restructuring and transformation expenses	(10.6)	(18.6)	(47.3)	(33.6)
Refinancing related costs	(5.0)	(30.5)	(11.9)	(44.6)
Net non-routine income (expense)	1.2	(2.0)	2.3	(2.7)
Corporate, Non-Segment
Summary of Segment Information
Operating profit (loss)	(66.5)	(64.6)	(129.1)	(133.5)
Consolidation, Eliminations
Summary of Segment Information
Reconciliation of operating profit (loss) from segments to consolidated	(98.6)	(138.4)	(226.8)	(259.4)
Banking | Operating Segments
Summary of Segment Information
Total revenue	707.4	664.9	1,356.2	1,257.8
Operating profit (loss)	134.6	102.4	250.9	182.3
Retail | Operating Segments
Summary of Segment Information
Total revenue	232.3	252.4	478.9	512.8
Operating profit (loss)	$ 34.7	$ 32.1	$ 70.4	$ 71.1