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Debt Covenant Ratios (Details)	Mar. 31, 2019	Dec. 31, 2018
Credit Agreement
Debt Instrument [Line Items]
Net total lease adjusted leverage ratio	5.8	5.6
Net secured debt lease adjusted leverage ratio	2.8	2.6
Bond leverage ratio, per indentures	6.1	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, per indentures	6.5
Credit Agreement | Minimum
Debt Instrument [Line Items]
Fixed charge coverage ratio	1.5
Senior Notes 4.875 Percent due 2027, GBP Notes due 2025 and 5.25 Percent Notes [Member]
Debt Instrument [Line Items]
Debt Instrument Covenant, Indenture, Leverage Ratio Maximum	7.0

X

- Definition

Debt Instrument Covenant, Indenture, Leverage Ratio Maximum

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No definition available.

+ Details

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X

- Definition

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

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No definition available.

+ Details

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X

- Definition

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

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No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- 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.

+ Details

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X

- 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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