Discontinued Operations (Details) - USD ($) $ in Millions		12 Months Ended
	Aug. 17, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of discontinued operations		$ 0.0	$ 0.0	$ 216.9
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Income from discontinued operations, net of income taxes		0.0	1.2	178.1
Disposal Group, Including Discontinued Operation, Cash Flow Disclosures [Abstract]
Net cash provided by (used in) investing activities		$ 0.0	9.8	503.8
Oxford Business | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Sale of Property Held-for-sale	$ 525.0
Cash received related to the finalization of the purchase price			9.8
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenues			324.3
Costs of services			223.0
Gross profit			101.3
Selling, general, and administrative expenses			90.1
Amortization of intangible assets			0.4
Income before income taxes			10.8
Provision for income taxes			1.5
Gain on sale, net of income taxes			168.8
Income from discontinued operations, net of income taxes			$ 178.1
Disposal Group, Including Discontinued Operation, Cash Flow Disclosures [Abstract]
Net cash provided by (used in) operating activities				(84.0)
Other				3.9
Net cash provided by (used in) investing activities				$ 499.9