Goodwill and Intangible Assets - Schedule of Finite-Lived and Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024
Finite-lived Intangible Assets [Roll Forward]
Amortization	$ (88.9)	$ (90.8)	$ (95.8)	$ (99.0)
Other indefinite-lived intangibles
Balance at beginning of period	1,280.0	1,280.0	1,280.0	1,280.0
Additions at cost	0.0	0.0	0.0	0.0
Other	0.0	0.0	0.0	0.0
Balance at end of period	1,280.0	1,280.0	1,280.0	1,280.0
Total
Balance at beginning of period	3,435.0	3,506.8	3,805.2	3,915.9
Additions at cost	0.3	0.2	0.3	0.1
Amortization	(88.9)	(90.8)	(95.8)	(99.0)
Other	26.1	18.8	(0.1)	(11.8)
Balance at end of period	3,372.5	3,435.0	3,709.6	3,805.2
Customer relationships
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	1,064.4	1,108.7	1,261.7	1,316.7
Additions at cost	0.0	0.0	0.0	0.0
Amortization	(46.5)	(47.9)	(50.5)	(52.4)
Other	3.6	3.6	0.3	(2.6)
Balance at end of period	1,021.5	1,064.4	1,211.5	1,261.7
Total
Amortization	(46.5)	(47.9)	(50.5)	(52.4)
Reacquired rights
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	206.3	200.3	222.8	233.9
Additions at cost	0.0	0.0	0.0	0.0
Amortization	(5.0)	(4.6)	(4.7)	(4.8)
Other	17.3	10.6	(0.7)	(6.3)
Balance at end of period	218.6	206.3	217.4	222.8
Total
Amortization	(5.0)	(4.6)	(4.7)	(4.8)
Database
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	758.8	790.0	900.5	940.6
Additions at cost	0.0	0.0	0.0	0.0
Amortization	(33.2)	(34.2)	(36.5)	(37.7)
Other	2.1	3.0	0.3	(2.4)
Balance at end of period	727.7	758.8	864.3	900.5
Total
Amortization	(33.2)	(34.2)	(36.5)	(37.7)
Other intangibles
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	125.5	127.8	140.2	144.7
Additions at cost	0.3	0.2	0.3	0.1
Amortization	(4.2)	(4.1)	(4.1)	(4.1)
Other	3.1	1.6	0.0	(0.5)
Balance at end of period	124.7	125.5	136.4	140.2
Total
Amortization	$ (4.2)	$ (4.1)	$ (4.1)	$ (4.1)