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Discontinued Operations and Disposal Groups - Narrative (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended
	Aug. 17, 2021	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Assets and Liabilities Held for Sale and Discontinued Operation
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax			$ 0.0	$ (218.6)
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax				149.3
Capital Expenditure, Discontinued Operations				(3.9)
Oxford Business | Discontinued Operations
Assets and Liabilities Held for Sale and Discontinued Operation
Proceeds from Sale of Property Held-for-sale	$ 525.0
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax		$ 149.3		$ 149.3

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Amount of capital expenditure attributable to discontinued operations.

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