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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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- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

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Term of lessee's finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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For banks, the total amount of real estate assets held for development and sale.

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Amount of cash inflow after closing and debt issuance costs received by a seller-lessee in a sale-leaseback recognized in financing activities.

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