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Debt - Covenant Ratios (Details) $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2018
Credit Agreement
Debt Instrument [Line Items]
Letters of credit outstanding	$ 35,251
Net total lease adjusted leverage ratio	5.7	5.6
Net secured debt lease adjusted leverage ratio	2.3	2.6
Bond leverage ratio (not lease adjusted)	5.9	5.8
Fixed charge coverage ratio	2.2	2.2
Credit Agreement | Maximum
Debt Instrument [Line Items]
Net total lease adjusted leverage ratio	6.5
Net secured debt lease adjusted leverage ratio	4.0
Bond leverage ratio (not lease adjusted)	7.0
Credit Agreement | Minimum
Debt Instrument [Line Items]
Bond leverage ratio (not lease adjusted)	6.5
Fixed charge coverage ratio	1.5
Revolving Credit Facility
Debt Instrument [Line Items]
Letters of credit outstanding	$ 4,853
Senior And Senior Subordinated Notes
Debt Instrument [Line Items]
Maximum allowable leverage ratio under indentures pertaining to senior and senior subordinated notes	6.5
GBP Notes due 2025, Senior Notes 4.785 due 2027, Senior Notes 5.25 Notes and Senior Notes 4.785 due 2029
Debt Instrument [Line Items]
Maximum allowable leverage ratio under indentures pertaining to senior and senior subordinated notes	7.0

X

- Definition

Debt Instrument Covenant, Indenture, Leverage Ratio Maximum

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No definition available.

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- Definition

The bond leverage ratio, per the indentures, at the end of the reporting period.

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No definition available.

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- Definition

Revolving credit and term leverage ratio at the end of the reporting period.

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No definition available.

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- Definition

Represents the entity's revolving credit and term loan fixed charge coverage ratio at the end of the reporting period.

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No definition available.

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- Definition

Represents the entity's revolving credit and term loan, net secured debt lease adjusted leverage ratio at the end of the reporting period.

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No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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No definition available.

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- Details

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- Details

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- Details

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X

- Details

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- Details

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