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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Stock Repurchases Pursuant To Board Of Director Authorizations | The remaining repurchases were made pursuant to the following authorizations (in millions of shares):
|  | Shares Repurchased |  | Authorization Remaining at December 31, 2017
Board of Directors’ Authorization |  | 2017 |  | 2016 |  | 2015 |
1997 Authorization |  | — |  |  | — |  |  | 0.9 |  |  | — |
2007 Authorization |  | — |  |  | — |  |  | 0.9 |  |  | — |
2014 Authorization |  | — |  |  | — |  |  | 20.0 |  |  | — |
2015 Authorization |  | — |  |  | 9.0 |  |  | 6.0 |  |  | — |
2016 Authorization |  | 8.7 |  |  | 0.7 |  |  | — |  |  | 10.6 |
Total |  | 8.7 |  |  | 9.7 |  |  | 27.8 |  |  | 10.6 |

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- Definition Tabular disclosure of treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 + Details
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