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Selected Quarterly Financial Data (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |
Selected Quarterly Financial Data (unaudited) |
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Total
| In millions, except per share data
2014 |  |  |  |  |  |  |  |  |
Total revenues | $ | 286.6 |  |  | $ | 365.8 |  |  | $ | 397.2 |  |  | $ | 401.4 |  |  | $ | 1,451.0 |
Net income | $ | 42.1 |  |  | $ | 53.1 |  |  | $ | 51.3 |  |  | $ | 58.5 |  |  | $ | 205.0 |
Per Share Data (1) |  |  |  |  |  |  |  |  |
Basic | $ | 0.92 |  |  | $ | 1.17 |  |  | $ | 1.16 |  |  | $ | 1.32 |  |  | $ | 4.55 |
Diluted | $ | 0.90 |  |  | $ | 1.15 |  |  | $ | 1.14 |  |  | $ | 1.30 |  |  | $ | 4.48 |
2013 |  |  |  |  |  |  |  |  |
Total revenues | $ | 272.3 |  |  | $ | 338.9 |  |  | $ | 353.2 |  |  | $ | 356.6 |  |  | $ | 1,321.0 |
Net income | $ | 27.1 |  |  | $ | 35.1 |  |  | $ | 53.8 |  |  | $ | 53.3 |  |  | $ | 169.3 |
Per Share Data (1) |  |  |  |  |  |  |  |  |
Basic | $ | 0.58 |  |  | $ | 0.75 |  |  | $ | 1.16 |  |  | $ | 1.16 |  |  | $ | 3.64 |
Diluted | $ | 0.57 |  |  | $ | 0.74 |  |  | $ | 1.15 |  |  | $ | 1.14 |  |  | $ | 3.59 |
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(1) | Quarterly earnings per share may not be additive, as per share amounts are computed independently for each quarter and the full year is based on the respective weighted average common shares and common stock equivalents outstanding.

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and 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=35737889&loc=d3e1280-108306 + Details
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