Supplemental Financial Data - Other Non-Current Assets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Right of use assets	$ 43.1	$ 53.1
Prepaid pension assets	5.6	4.0
Investments	20.6	21.8
Deferred income tax	17.2	16.0
Long-term contract assets	18.0	5.6	$ 9.1
Prepaid cloud computing fees and deferred implementation costs	23.2	13.8
Other	60.1	29.9
Total	$ 187.8	$ 144.2