Supplemental Financial Data - Other Intangibles (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2022	Dec. 31, 2021
Finite-lived Intangible Assets [Roll Forward]
Amortization		$ (449.7)	$ (490.7)
WWN Relationship Transfer	$ 0.0
Balance at end of period		3,671.9
Indefinite-lived Intangible Assets [Roll Forward]
Balance at beginning of period		1,280.0	1,275.8
Additions at cost		0.0	4.2
Other		0.0	0.0
Balance at end of period		1,280.0	1,280.0
Total
Balance at beginning of period		4,824.5	4,814.8
Acquisitions			532.4
Additions at cost		0.7	11.8
Amortization		(449.7)	(490.7)
Other		(55.4)	(43.8)
Balance at end of period		4,320.1	4,824.5
In-place lease intangibles		7.1
Acquisitions		4.2
Noncash or part noncash acquisition, intangible assets acquired		15.0	7.9
Accounts Payable and Accrued Liabilities
Total
Noncash or part noncash acquisition, intangible assets acquired		10.3	0.9
Other Noncurrent Liabilities
Total
Noncash or part noncash acquisition, intangible assets acquired		4.7	2.5
Deferred Income Tax
Total
Noncash or part noncash acquisition, intangible assets acquired			4.5
Customer relationships
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period		1,793.3	1,912.9
Acquisitions			147.8
Additions at cost		0.0	0.0
Amortization		(240.3)	(259.0)
Other		(16.3)	(8.4)
Balance at end of period		1,536.7	1,793.3
Total
Amortization		(240.3)	(259.0)
Accumulated amortization of intangibles		988.9	755.1
Reacquired rights
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period		284.7	0.0
Acquisitions			270.0
Additions at cost		0.0	0.0
Amortization		(18.7)	(26.6)
WWN Relationship Transfer	64.7
Other		(20.5)	(23.4)
Balance at end of period		245.5	284.7
Total
Amortization		(18.7)	(26.6)
Accumulated amortization of intangibles		42.6	25.6
Database
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period		1,285.1	1,369.4
Acquisitions			113.2
Additions at cost		0.0	0.0
Amortization		(173.8)	(188.6)
Other		(11.3)	(8.9)
Balance at end of period		1,100.0	1,285.1
Total
Amortization		(173.8)	(188.6)
Accumulated amortization of intangibles		711.4	540.4
Other intangibles
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period		181.4	256.7
Acquisitions			1.4
Additions at cost		0.7	7.6
Amortization		(16.9)	(16.5)
WWN Relationship Transfer	$ (64.7)
Other		(7.3)	(3.1)
Balance at end of period		157.9	181.4
Total
Amortization		(16.9)	(16.5)
Accumulated amortization of intangibles		$ 59.1	$ 44.2