Goodwill and Intangible Assets - Other Intangibles (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Finite-lived Intangible Assets [Roll Forward]
Amortization	$ (115.8)	$ (122.4)
WWN relationship transfer		0.0
Other indefinite-lived intangibles
Balance at beginning of period	1,280.0	1,275.8
Acquisition		0.0
Additions at cost	0.0	0.0
Other	0.0	0.0
Balance at end of period	1,280.0	1,275.8
Total
Balance at beginning of period	4,824.5	4,814.8
Acquisition		493.0
Additions at cost	0.2	0.2
Amortization	(115.8)	(122.4)
Other	(19.2)	(27.9)
Balance at end of period	4,689.7	5,157.7
Customer relationships
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	1,793.3	1,912.9
Acquisition		106.0
Additions at cost	0.0	0.0
Amortization	(61.9)	(65.6)
Other	(4.7)	(5.4)
Balance at end of period	1,726.7	1,947.9
Total
Amortization	(61.9)	(65.6)
Reacquired rights
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	284.7	0.0
Acquisition		271.0
Additions at cost	0.0	0.0
Amortization	(5.1)	(5.0)
WWN relationship transfer		64.7
Other	(7.9)	(14.3)
Balance at end of period	271.7	316.4
Total
Amortization	(5.1)	(5.0)
Database
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	1,285.1	1,369.4
Acquisition		116.0
Additions at cost	0.0	0.0
Amortization	(44.6)	(47.8)
Other	(4.6)	(6.3)
Balance at end of period	1,235.9	1,431.3
Total
Amortization	(44.6)	(47.8)
Other intangibles
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	181.4	256.7
Acquisition		0.0
Additions at cost	0.2	0.2
Amortization	(4.2)	(4.0)
WWN relationship transfer		(64.7)
Other	(2.0)	(1.9)
Balance at end of period	175.4	186.3
Total
Amortization	$ (4.2)	$ (4.0)