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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2014
Earnings Per Share [Abstract] |
Schedule of Weighted Average Number of Shares [Table Text Block] |
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
(in millions) |  | 2014 |  | 2013 |  | 2014 |  | 2013
Net income |  | $ | 248.3 |  |  | $ | 37.2 |  |  | $ | 279.1 |  |  | $ | 93.5 |
Weighted average shares for basic EPS |  | 120.0 |  |  | 120.0 |  |  | 112.3 |  |  | 112.3 |
Dilutive potential shares from grants of RSUs, PRSUs and stock options(a) |  | 0.7 |  |  | 0.7 |  |  | 0.5 |  |  | 0.5 |
Weighted average shares for diluted EPS |  | 120.7 |  |  | 120.7 |  |  | 112.8 |  |  | 112.8 |
(a) | The potential impact of an aggregate 0.1 million granted RSUs, PRSUs and stock options for each of the three months and nine months ended September 30, 2014, was antidilutive.

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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