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Equity and Earnings (Loss) Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Schedule of Earnings (Loss) Per Share, Basic and Diluted | The following table sets forth the computation of basic and diluted earnings (loss) per share (in millions, except per share data).
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Basic and diluted earnings (loss) per share: |  |  |  |  |
Numerator: |  |  |  |  |
Net income (loss), basic and diluted | $ | 160.3 |  |  | $ | (19.7 | ) |  | $ | 111.3 |
Denominator: |  |  |  |  |
Basic weighted average common shares | 28.3 |  |  | 28.3 |  |  | 30.2 |
Stock options, RSUs and PSUs(a) | 0.3 |  |  | — |  |  | — |
Weighted average shares used to calculate diluted earnings (loss) per share | 28.6 |  |  | 28.3 |  |  | 30.2 |
Earnings (loss) per share: |  |  |  |  |
Basic | $ | 5.66 |  |  | $ | (0.70 | ) |  | $ | 3.69 |
Diluted | $ | 5.60 |  |  | $ | (0.70 | ) |  | $ | 3.69 |
Antidilutive stock options, RSUs and PSUs(a) | 0.4 |  |  | 0.3 |  |  | — |
(a) The dilutive impact of stock options, RSUs and PSUs for the years ended December 31, 2016 and 2015 and antidilutive impact for the year ended 2015, rounds to zero for each period.

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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://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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