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Discontinued Operations and Disposal Groups - Results of Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Results of Operations, Discontinued Operations
Income from discontinued operations, net of income taxes	$ (0.1)	$ 6.9	$ (0.9)	$ 12.8
Oxford Business | Discontinued Operations
Results of Operations, Discontinued Operations
Revenues		134.1		252.8
Costs of services		92.6		174.0
Gross profit		41.5		78.8
Selling, general and administrative expenses		32.9		62.5
Amortization of intangible assets		0.1		0.3
Income before income taxes		8.5		16.0
Provision for income taxes		1.6		3.2
Income from discontinued operations, net of income taxes		$ 6.9		$ 12.8

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