v2.4.0.6

Financial Instruments and Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Foreign Currency Forwards [Member] |  |  |
Derivative activity |  |  |
Notional amounts at January 1 | $ 0 |  | $ 0
New contracts | 0 |  | 351.7
Acquired contracts | 0 |  |
Matured or expired contracts | 0 |  | (351.7)
Notional amounts at December 31 | 0 |  | 0
Interest Rate Swaps [Member] |  |  |
Derivative activity |  |  |
Notional amounts at January 1 | 268.1 | 157.7 | 0
New contracts | 0 | 155.0 | 157.7
Acquired contracts | 1,337.3 |  |
Matured or expired contracts | (108.9) | (44.6) |
Notional amounts at December 31 | 1,496.5 | 268.1 | 157.7
Interest Rate Cap [Member] |  |  |
Derivative activity |  |  |
Notional amounts at January 1 | 0 |  |
New contracts | 0 |  |
Acquired contracts | 25.7 |  |
Matured or expired contracts | (25.7) |  |
Notional amounts at December 31 | $ 0 |  |

X
- Definition Acquired Contracts. + References No definition available. + Details
Name: | pld_AcquiredContracts
Namespace Prefix: | pld_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | pld_DerivativeInstrumentsAndHedgesDetailsAbstract
Namespace Prefix: | pld_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Matured or expired derivative contracts. + References No definition available. + Details
Name: | pld_MaturedOrExpiredDerivativeContracts
Namespace Prefix: | pld_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition New contracts. + References No definition available. + Details
Name: | pld_NewContracts
Namespace Prefix: | pld_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Aggregate notional amount of all derivatives. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
Name: | us-gaap_NotionalAmountOfDerivatives
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant