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Common Shareholders' Equity, Equity Rollforward (Details) - shares | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Common shareholders' equity, share rollforward |  |  |
Common stock, shares issued beginning balance | 132,749,000 |  |
Common stock, shares issued ending balance | 132,782,000 | 132,749,000 |
Treasury Common Shares |  |  |
Common shareholders' equity, share rollforward |  |  |
Treasury shares, beginning balance | 24,850,000 |  |
Treasury shares, ending balance | 23,816,000 | 24,850,000 |
Common Shares |  |  |
Common shareholders' equity, share rollforward |  |  |
Common stock, shares issued beginning balance | 125,570,000 | 125,545,000 | 125,512,000
Conversion of Series A Common shares | 1,000 | 25,000 | 33,000
Common stock, shares issued ending balance | 125,571,000 | 125,570,000 | 125,545,000
Common Shares | Treasury Common Shares |  |  |
Common shareholders' equity, share rollforward |  |  |
Treasury shares, beginning balance | 24,850,000 | 23,954,000 | 24,641,000
Repurchase of shares |  | 1,542,000 | 339,000
Dividend reinvestment, incentive and compensation plans - Treasury shares | (1,034,000) | (646,000) | (1,026,000)
Treasury shares, ending balance | 23,816,000 | 24,850,000 | 23,954,000
Common Shares | Series A Share Conversion |  |  |
Common shareholders' equity, other disclosures |  |  |
Shares reserved | 7,211,260 |  |
Common Shares | Tax-Deferred Savings Plan |  |  |
Common shareholders' equity, other disclosures |  |  |
Shares reserved | 90,341 |  |
Series A Common Shares |  |  |
Common shareholders' equity, share rollforward |  |  |
Common stock, shares issued beginning balance | 7,179,000 | 7,166,000 | 7,160,000
Conversion of Series A Common shares | (1,000) | (25,000) | (33,000)
Dividend reinvestment, incentive and compensation plans | 33,000 | 38,000 | 39,000
Common stock, shares issued ending balance | 7,211,000 | 7,179,000 | 7,166,000

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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