Summary Of Significant Accounting Policies (Goodwill And Intangible Assets) (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Goodwill balance	$ 174.6us-gaap_Goodwill	$ 174.6us-gaap_Goodwill
Shurgard trade name, book value	18.8	18.8
Tenant intangibles net book value	35.2psa_TenantIntangiblesNetBookValue	53.4psa_TenantIntangiblesNetBookValue
Accumulated amortization, tenant intangibles	69.3	35.1
Amortization expense, tenant intangibles	48.4us-gaap_AmortizationOfIntangibleAssets	24.1us-gaap_AmortizationOfIntangibleAssets	10.5us-gaap_AmortizationOfIntangibleAssets
Estimated future amortization expense, 2015	22.3
Estimated future amortization expense, 2016	5.6
Estimated future amortization expense, thereafter	7.3
Increase in tenant intangibles	30.2	61.5	9.1
Consolidation Of Facilities [Member]
Business Acquisition [Line Items]
Increase in tenant intangibles, other investments			$ 0.9

Asset Impairment Charge, Real Estate Facilities

No definition available.

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- Definition

Finite-Lived Intangible Assets, Amortization Expense, Thereafter

+ References

No definition available.

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- Definition

This element represents the estimated value of the tenants in-place at the date of acquisition of each respective facility.

+ References

No definition available.

+ Details

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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-Publisher FASB

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- Definition

Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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- Definition

Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

The increase (decrease) during the reporting period in intangible assets (for example patents and licenses).

+ References

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- Definition

Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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