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Earnings per Share (Notes) | 9 Months Ended
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Sep. 30, 2014
Earnings Per Share [Abstract] |
Earnings Per Share [Text Block] |
8. | Earnings per Share
The numerator for both basic and diluted earnings per share is net income. The denominator for basic earnings per share is the weighted average number of common shares outstanding during the period. The dilutive effect of outstanding restricted stock, restricted stock units, stock options, Coworker Stock Purchase Plan units and MPK Plan units is reflected in the denominator for diluted earnings per share using the treasury stock method. The following is a reconciliation of basic shares to diluted shares:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in millions) | 2014 |  | 2013 |  | 2014 |  | 2013
Weighted-average shares - basic | 170.9 |  |  | 166.8 |  |  | 170.2 |  |  | 152.5 |
Effect of dilutive securities | 2.1 |  |  | — |  |  | 2.5 |  |  | 1.8 |
Weighted-average shares - diluted | 173.0 |  |  | 166.8 |  |  | 172.7 |  |  | 154.3 |
There was an insignificant amount of potential common shares excluded from diluted earnings per share for the three and nine month periods ended September 30, 2014, as their inclusion would have had an anti-dilutive effect. There were 6.3 million and 0.1 million potential common shares excluded from diluted earnings per share for the three and nine month periods ended September 30, 2013, as their inclusion would have had an anti-dilutive effect.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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