Other Assets and Liabilities - Schedule of Other Non-Current Assets (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Other Assets And Other Liabilities [Abstract]
Right of use assets	$ 39.7	$ 42.6
Prepaid pension assets	6.0	5.5
Investments	33.8	32.4
Deferred income tax	6.5	2.9
Long-term contract assets	33.2	32.8
Prepaid cloud computing fees and deferred implementation costs	38.6	37.1
Long-term technology vendor contracts	72.0	79.3
Other	33.9	19.4
Total	$ 263.7	$ 252.0