Goodwill and Intangible Assets - Other Intangibles (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021
Finite-lived Intangible Assets [Roll Forward]
Amortization	$ (112.0)	$ (115.8)	$ (122.9)	$ (122.4)
WWN relationship transfer				0.0
Other indefinite-lived intangibles
Balance at beginning of period	1,280.0	1,280.0	1,275.8	1,275.8
Acquisition			0.0	0.0
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	1,275.8	1,275.8
Total
Balance at beginning of period	4,689.7	4,824.5	5,157.7	4,814.8
Acquisition			(4.0)	493.0
Additions at cost	0.2	0.2	7.3	0.2
Amortization	(112.0)	(115.8)	(122.9)	(122.4)
Other	(36.2)	(19.2)	9.2	(27.9)
Balance at end of period	4,541.7	4,689.7	5,047.3	5,157.7
Customer relationships
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	1,726.7	1,793.3	1,947.9	1,912.9
Acquisition				106.0
Acquisitions			2.0
Additions at cost	0.0	0.0	0.0	0.0
Amortization	(59.7)	(61.9)	(64.5)	(65.6)
Other	(9.6)	(4.7)	2.5	(5.4)
Balance at end of period	1,657.4	1,726.7	1,887.9	1,947.9
Total
Amortization	(59.7)	(61.9)	(64.5)	(65.6)
Reacquired rights
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	271.7	284.7	316.4	0.0
Acquisition				271.0
Acquisitions			(1.0)
Additions at cost	0.0	0.0	0.0	0.0
Amortization	(4.7)	(5.1)	(7.4)	(5.0)
WWN relationship transfer				64.7
Other	(15.7)	(7.9)	4.1	(14.3)
Balance at end of period	251.3	271.7	312.1	316.4
Total
Amortization	(4.7)	(5.1)	(7.4)	(5.0)
Database
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	1,235.9	1,285.1	1,431.3	1,369.4
Acquisition				116.0
Acquisitions			(5.0)
Additions at cost	0.0	0.0	0.0	0.0
Amortization	(43.2)	(44.6)	(47.0)	(47.8)
Other	(5.9)	(4.6)	2.4	(6.3)
Balance at end of period	1,186.8	1,235.9	1,381.7	1,431.3
Total
Amortization	(43.2)	(44.6)	(47.0)	(47.8)
Other intangibles
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	175.4	181.4	186.3	256.7
Acquisition				0.0
Acquisitions			0.0
Additions at cost	0.2	0.2	7.3	0.2
Amortization	(4.4)	(4.2)	(4.0)	(4.0)
WWN relationship transfer				(64.7)
Other	(5.0)	(2.0)	0.2	(1.9)
Balance at end of period	166.2	175.4	189.8	186.3
Total
Amortization	$ (4.4)	$ (4.2)	$ (4.0)	$ (4.0)