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Basis of Financial Statements - Recent Developments (Details) - USD ($) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Mar. 21, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Prepaid expenses and other current assets |  | $ 29.0 |  | $ 25.2
Reclass from property and equipment, net |  | (168.7) |  | $ (176.4)
Proceeds from sale of corporate office |  | 13.2 | $ 0.0 |
ABRH | Restatement Adjustment |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Reclass from property and equipment, net |  | (2.4) |  |
ABRH | Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Proceeds from sale of corporate office | $ 13.2 |  |  |
Lease term | 15 years |  |  |
Liability for finance obligation |  | 13.2 |  |
ABRH | Disposal Group, Held-for-sale, Not Discontinued Operations | Prepaid Expenses and Other Current Assets |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Real estate assets held for sale |  | (11.2) |  |
ABRH | Disposal Group, Held-for-sale, Not Discontinued Operations | Restatement Adjustment |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Prepaid expenses and other current assets |  | 4.3 |  |
Real estate assets held for sale |  | 2.4 |  |
Reclass from property and equipment, net |  | $ 4.3 |  |

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