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Discontinued Operations and Disposal Groups - Results of Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Results of Operations, Discontinued Operations
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax				$ 149.3
Income from discontinued operations, net of income taxes	$ 2.1	$ 145.7	$ 1.2	158.5
Oxford Business | Discontinued Operations
Results of Operations, Discontinued Operations
Revenues		71.6		324.3
Costs of services		49.0		223.0
Gross profit		22.6		101.3
Selling, general and administrative expenses		27.5		89.9
Amortization of intangible assets		0.1		0.4
Income (loss) before income taxes		(5.0)		11.0
Provision (benefit) for income taxes		(1.4)		1.8
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax		149.3		149.3
Income from discontinued operations, net of income taxes		$ 145.7		$ 158.5

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