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Borrowings Indentures Covenant (Details) - Unsecured Debt - 4.0% Senior Notes due 2025 [Member]	Dec. 31, 2015
Debt Instrument [Line Items]
Covenant Obligation, Debt to Total Asset Value	60.00%
Covenant Obligation, Unencumbered Leverage Ratio	150.00%

X

- Definition

Covenant Obligation, Debt to Total Asset Value

+ References

No definition available.

+ Details

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X

- Definition

Covenant Obligation, Unencumbered Leverage Ratio

+ References

No definition available.

+ Details

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Period Type:	instant

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

- Details

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X

- Details

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