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Notes Payable (Tables) | 9 Months Ended
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Sep. 30, 2013
Notes Payable [Abstract] |
Summary Of Indebtedness | The following is a summary of our indebtedness:
| Balance at
(in millions) | September 30, 2013 |  | December 31, 2012
Commercial Banks |  |  |
Unsecured line of credit and short-term borrowings | $ | 183.0 |  |  | $ | — |
Senior unsecured notes |  |  |
5.45% Notes, due 2013 | 200.0 |  |  | 199.9 |
5.08% Notes, due 2015 | 249.7 |  |  | 249.5 |
5.75% Notes, due 2017 | 246.4 |  |  | 246.3 |
4.70% Notes, due 2021 | 248.8 |  |  | 248.7 |
3.07% Notes, due 2022 | 346.5 |  |  | 346.3 |
5.00% Notes, due 2023 | 247.6 |  |  | 247.5 |
| 1,539.0 |  |  | 1,538.2 |
Total unsecured notes payable | 1,722.0 |  |  | 1,538.2 |
Secured notes |  |  |
1.00% – 6.00% Conventional Mortgage Notes, due 2014 – 2045 | 906.4 |  |  | 934.6 |
Tax-exempt Mortgage Note due 2028 (1.26% floating rate) | 36.6 |  |  | 37.7 |
| 943.0 |  |  | 972.3 |
Total notes payable | $ | 2,665.0 |  |  | $ | 2,510.5 |
Other floating rate debt included in secured notes (1.00%) | $ | 175.0 |  |  | $ | 175.0 |
Scheduled Repayments On Outstanding Debt | Scheduled repayments on outstanding debt, including our unsecured line of credit, short-term borrowings and scheduled principal amortizations, and the respective weighted average interest rate on maturing debt at September 30, 2013, were as follows:
(in millions) | Amount |  | Weighted Average Interest Rate
2013 | $ | 200.8 |  |  | 5.5 | %
2014 | 35.4 |  |  | 3.2 |
2015 | 435.0 |  |  | 3.3 |
2016 (1) | 2.2 |  |  | — |
2017 | 249.2 |  |  | 5.8 |
Thereafter | 1,742.4 |  |  | 4.2 |
Total | $ | 2,665.0 |  |  | 4.3 | %
(1) Includes only scheduled principal amortizations.

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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