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Notes Payable (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended |  | 3 Months Ended |  |  |  |  |
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Jun. 30, 2011 | Dec. 31, 2011 years | Dec. 31, 2010 | Dec. 31, 2009 | Sep. 30, 2011 Line Of Credit [Member] | Dec. 31, 2011 Line Of Credit [Member] | Dec. 31, 2011 Letter Of Credit [Member] | Jun. 30, 2011 4.625% Notes Due 2021 [Member] | Dec. 31, 2011 4.625% Notes Due 2021 [Member] | Jun. 30, 2011 4.875 Notes Due 2023 [Member] | Dec. 31, 2011 4.875 Notes Due 2023 [Member] | Sep. 30, 2011 Line Of Credit [Member] | Dec. 31, 2011 Line Of Credit [Member] | Jun. 30, 2011 Commercial Banks [Member] Term Loan, Due 2012 [Member] | Jun. 30, 2011 Senior Unsecured Notes [Member] 4.625% Notes Due 2021 [Member] | Dec. 31, 2011 Senior Unsecured Notes [Member] 4.70% Notes Due 2021 [Member] | Jun. 30, 2011 Senior Unsecured Notes [Member] 4.875 Notes Due 2023 [Member] | Dec. 31, 2011 Senior Unsecured Notes [Member] 5.00% Notes Due 2023 [Member] | Dec. 31, 2011 Senior Unsecured Notes [Member] 7.69% Notes Due 2011 [Member] | Dec. 31, 2011 Medium-Term Notes [Member] 4.99% Notes Due 2011 [Member] | Dec. 31, 2011 Floating Rate Debt [Member] | Dec. 31, 2010 Floating Rate Debt [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of current borrowing capacity under unsecured credit facility |  |  |  |  | $ 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior maturity period of unsecured credit facility |  |  |  |  | August 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current maturity period of unsecured credit facility |  |  |  |  |  |  |  |  |  |  |  | September 2015 |  |  |  |  |  |  |  |  |  |
Optional extension period of unsecured credit facility |  |  |  |  |  |  |  |  |  |  |  | September 2016 |  |  |  |  |  |  |  |  |  |
Maximum term of bid rate loans (days) |  |  |  |  |  | 180 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lesser of amount stated or the amount available under the line of credit |  |  |  |  |  | 250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity under unsecured credit facility |  |  |  |  |  |  | 100 |  |  |  |  |  | 750 |  |  |  |  |  |  |  |  |
Outstanding letters of credit under credit facility |  |  |  |  |  |  | 10.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available amount under unsecured credit facility |  |  |  |  |  | 489.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of senior unsecured notes |  | 500 |  |  |  |  |  |  |  |  |  |  |  | 500 |  |  |  |  |  |  |  |
Interest rate of notes payable |  |  |  |  |  |  |  | 4.625% |  | 4.875% |  |  |  |  |  |  |  |  |  |  |  |
Yield to maturity interest rate on notes payable |  |  |  |  |  |  |  | 4.70% |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |
Yield to maturity interest rate on notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.70% |  | 5.00% | 7.69% | 4.99% |  |
Aggregate principal face amount of senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250 |  | 250 |  |  |  |  |
Net proceeds from notes payable | 491.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable, maturity date |  |  |  |  |  |  |  | Jun. 01, 2021 |  | Jun. 01, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Discount on notes payable face amount |  |  |  |  |  |  |  |  | 99.404% |  | 98.878% |  |  |  |  |  |  |  |  |  |  |
Fair value adjustment of assumed debt |  | 33.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold period for redemption of notes (days) |  | 90 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price as percentage of principal plus accrued and unpaid interest if redeemed at or prior to threshold period |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease of interest expense as a result of amortization of fair value adjustment |  | 0.4 | 1.1 | 2.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write off of unamortized loan costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.5 |  |  |  |  |  |  |  |
Weighted average interest rate on floating rate debt |  | 4.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.10% | 1.30%
Weighted average maturity of indebtedness (including unsecured line of credit) (in years) |  | 6.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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