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Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Summary of Quarterly Operating Results |
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
(In millions, except per share data) | 2017 |  | 2017 |  | 2017 |  | 2017
Revenues | $ | 389.4 |  |  | $ | 415.8 |  |  | $ | 457.6 |  |  | $ | 491.7 |
Income (loss) before income taxes | (54.3 | ) |  | (49.8 | ) |  | 18.6 |  |  | 21.1 |
Net income (loss)(a) | (39.2 | ) |  | (27.6 | ) |  | 12.8 |  |  | 214.3 |
Earnings (loss) per share: |  |  |  |  |  |  |
Basic | $ | (1.39 | ) |  | $ | (0.98 | ) |  | $ | 0.45 |  |  | $ | 7.57 |
Diluted | $ | (1.39 | ) |  | $ | (0.98 | ) |  | $ | 0.45 |  |  | $ | 7.44 |
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
(In millions, except per share data) | 2016 |  | 2016 |  | 2016 |  | 2016
Revenues | $ | 365.6 |  |  | $ | 380.4 |  |  | $ | 403.6 |  |  | $ | 405.2 |
Income (loss) before income taxes | (1.5 | ) |  | (2.7 | ) |  | 6.7 |  |  | (7.4 | )
Net income (loss) | (1.5 | ) |  | (8.0 | ) |  | 3.0 |  |  | (13.2 | )
Earnings (loss) per share: |  |  |  |  |  |  |
Basic | $ | (0.05 | ) |  | $ | (0.28 | ) |  | $ | 0.11 |  |  | $ | (0.47 | )
Diluted | $ | (0.05 | ) |  | $ | (0.28 | ) |  | $ | 0.11 |  |  | $ | (0.47 | )

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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