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Earnings Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | A reconciliation of our basic and diluted net income per common share is as follows:
|  | Year Ended December 31,
(In millions, except per share data) |  | 2018 |  | 2017 |  | 2016
Net income to common shareholders |  | $ | 207.1 |  |  | $ | 36.7 |  |  | $ | 38.8 |
Basic weighted average shares outstanding |  | 239.0 |  |  | 240.4 |  |  | 238.1 |
Diluted weighted average shares outstanding |  | 242.9 |  |  | 246.1 |  |  | 244.4 |
Net income per common share: |  |  |  |  |  |
Basic net income per share |  | $ | 0.87 |  |  | $ | 0.15 |  |  | $ | 0.16 |
Diluted net income per share |  | $ | 0.85 |  |  | $ | 0.15 |  |  | $ | 0.16 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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