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Discontinued Operations and Disposal Groups - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	Jun. 30, 2021	Dec. 31, 2021
Assets and Liabilities Held for Sale and Discontinued Operation
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax		$ 216.9
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax		$ 168.8
Oxford Business | Discontinued Operations
Assets and Liabilities Held for Sale and Discontinued Operation
Proceeds from Sale of Property Held-for-sale	$ 525.0

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Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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