Supplemental Financial Data - Schedule of Computer Software and Goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Computer software
Balance at beginning of period	$ 666,300,000	$ 631,800,000
Additions at cost	200,100,000	182,400,000
Amortization	(174,800,000)	(153,700,000)
Impairment / Write-off	(700,000)	(2,300,000)
Other	(14,600,000)	8,100,000
Balance at end of period	676,300,000	666,300,000	$ 631,800,000
Goodwill
Balance at beginning of period	3,445,800,000	3,431,300,000
Impairment / Write-off	0	0	0
Other	(36,000,000.0)	14,500,000
Balance at end of period	$ 3,409,800,000	$ 3,445,800,000	$ 3,431,300,000