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Earnings Per Share ("EPS") | 9 Months Ended
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Sep. 30, 2015
Earnings Per Share [Abstract] |
Earnings Per Share (EPS) | Earnings Per Share (“EPS”)
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
(in millions) |  | 2015 |  | 2014 |  | 2015 |  | 2014
Net income |  | $ | 21.2 |  |  | $ | 248.3 |  |  | $ | 44.5 |  |  | $ | 279.1 |
Weighted average shares for basic EPS |  | 137.5 |  |  | 120.0 |  |  | 137.3 |  |  | 112.3 |
Dilutive potential shares from grants of RSUs, PRSUs and stock options(a) |  | 0.4 |  |  | 0.7 |  |  | 0.5 |  |  | 0.5 |
Weighted average shares for diluted EPS |  | 137.9 |  |  | 120.7 |  |  | 137.8 |  |  | 112.8 |
(a) | The potential impact of an aggregate 0.6 million granted RSUs, PRSUs and stock options for the three months ended September 30, 2015, and an aggregate 0.1 million granted RSUs, PRSUs and stock options for the nine months ended September 30, 2015, were antidilutive. The potential impact of an aggregate 0.1 million granted RSUs, PRSUs and stock options for each of the three and nine months ended September 30, 2014, were antidilutive.

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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 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 2: 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 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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