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Debt - Covenant Ratios (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2018
Senior And Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Maximum allowable leverage ratio under indentures pertaining to senior and senior subordinated notes		6.5
Credit Agreement
Debt Instrument [Line Items]
Net total lease adjusted leverage ratio	5.0	5.6
Net secured debt lease adjusted leverage ratio	1.6	2.6
Bond leverage ratio (not lease adjusted)	5.8	5.8
Fixed charge coverage ratio	2.1	2.2
Credit Agreement | Maximum
Debt Instrument [Line Items]
Net total lease adjusted leverage ratio	6.5	6.5
Net secured debt lease adjusted leverage ratio	4.0	4.0
Credit Agreement | Minimum
Debt Instrument [Line Items]
Fixed charge coverage ratio	1.5	1.5
Senior Notes 4.875% due 2027, GBP Notes due 2025 and Senior Notes 5.25% Notes
Debt Instrument [Line Items]
Maximum allowable leverage ratio under indentures pertaining to senior and senior subordinated notes		7.0
Revolving Credit Facility
Debt Instrument [Line Items]
Repayment of debt	$ 807,000

X

- Definition

Debt Instrument Covenant, Indenture, Leverage Ratio Maximum

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

Revolving credit and term leverage 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 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.

+ References

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.

+ References

No definition available.

+ Details

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X

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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- Details

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- Details

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- Details

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- Details

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