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Discontinued Operations and Disposal Groups - Results of Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Results of Operations, Discontinued Operations
Income from discontinued operations, net of income taxes	$ 6.9	$ 5.3	$ 12.8	$ 10.0
Oxford Business | Discontinued Operations
Results of Operations, Discontinued Operations
Revenues	134.1	104.9	252.8	230.0
Costs of services	92.6	71.6	174.0	158.4
Gross profit	41.5	33.3	78.8	71.6
Selling, general and administrative expenses	32.9	26.2	62.5	58.1
Amortization of intangible assets	0.1	0.2	0.3	0.3
Income before income taxes	8.5	6.9	16.0	13.2
Provision for income taxes	1.6	1.6	3.2	3.2
Income from discontinued operations, net of income taxes	$ 6.9	$ 5.3	$ 12.8	$ 10.0

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