Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenue	$ 948.3	$ 728.2	$ 1,869.5	$ 1,427.1
Operating expenses
Cost of services (exclusive of depreciation and amortization below)	308.1	234.7	606.2	461.5
Selling, general and administrative	327.1	199.8	686.5	418.9
Depreciation and amortization	130.6	93.2	259.4	182.7
Total operating expenses	765.8	527.7	1,552.1	1,063.0
Operating income	182.5	200.4	317.4	364.0
Non-operating income and (expense)
Interest expense	(51.9)	(25.6)	(102.1)	(51.4)
Interest income	1.2	0.9	1.9	1.5
Earnings from equity method investments	3.1	2.7	6.1	5.7
Other income and (expense), net	(6.4)	2.2	(18.2)	1.8
Total non-operating income and (expense)	(54.0)	(19.7)	(112.2)	(42.3)
Income from continuing operations before income taxes	128.5	180.7	205.2	321.8
Provision for income taxes	(29.2)	(58.6)	(53.5)	(82.3)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	99.3	122.1	151.7	239.4
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	(0.3)	(10.8)	0.0	(24.1)
Net income	99.6	132.9	151.6	263.5
Less: net income attributable to the noncontrolling interests	(4.1)	(5.2)	(7.7)	(8.0)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	95.3	116.8	143.9	231.4
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0.3	10.8	0.0	24.1
Net income	$ 95.6	$ 127.6	$ 143.9	$ 255.6
Earnings Per Share, Basic [Abstract]
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.49	$ 0.61	$ 0.75	$ 1.21
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	0	0.06	0	0.13
Earnings Per Share, Basic	0.50	0.67	0.75	1.34
Earnings Per Share, Diluted [Abstract]
Income (Loss) from Continuing Operations, Per Diluted Share	0.49	0.61	0.75	1.20
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	0	0.06	0	0.13
Earnings Per Share, Diluted	$ 0.49	$ 0.66	$ 0.75	$ 1.33
Earnings Per Share, Diluted [Abstract]
Weighted Average Number of Shares Outstanding, Basic	192.5	191.4	192.3	191.2
Weighted Average Number of Shares Outstanding, Diluted	193.1	192.8	193.1	192.8