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Discontinued Operations and Disposal Groups - Results of Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Results of Operations, Discontinued Operations
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	$ 5.6	158.5	$ 15.6
Oxford Business | Discontinued Operations
Results of Operations, Discontinued Operations
Revenues	71.6	107.5	324.3	337.5
Costs of services	49.0	72.8	223.0	231.2
Gross profit	22.6	34.7	101.3	106.3
Selling, general and administrative expenses	27.5	27.1	89.9	85.2
Amortization of intangible assets	0.1	0.2	0.4	0.5
Income (loss) before income taxes	(5.0)	7.4	11.0	20.6
Provision (benefit) for income taxes	$ (1.4)	$ 1.8	$ 1.8	$ 5.0

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