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Discontinued Operations and Disposal Groups - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended
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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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