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Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
Schedule Of Quarterly Financial Data | The following quarterly financial data for the years ended December 31, 2016 and 2015 has been prepared in accordance with GAAP:
(In millions, except per share data) |  | 2016
|  | Quarters Ended
Income Statement Data |  | March 31 |  | June 30 |  | September 30 |  | December 31
Revenue |  | $ | 227.9 |  |  | $ | 238.5 |  |  | $ | 246.6 |  |  | $ | 256.2 |
Income before provision for income taxes |  | 118.4 |  |  | 134.7 |  |  | 136.5 |  |  | 141.6 |
Net income |  | 74.4 |  |  | 84.9 |  |  | 85.9 |  |  | 87.6 |
Net income per share (1): |  |  |  |  |  |  |  |
Basic |  | $ | 3.64 |  |  | $ | 4.17 |  |  | $ | 4.22 |  |  | $ | 4.35 |
Diluted |  | $ | 3.63 |  |  | $ | 4.17 |  |  | $ | 4.21 |  |  | $ | 4.33 |
(In millions, except per share data) |  | 2015
|  | Quarters Ended
Income Statement Data |  | March 31 |  | June 30 |  | September 30 |  | December 31
Revenue |  | $ | 194.2 |  |  | $ | 203.1 |  |  | $ | 210.2 |  |  | $ | 217.8 |
Income before provision for income taxes |  | 113.3 |  |  | 117.4 |  |  | 117.9 |  |  | 125.9 |
Net income |  | 71.5 |  |  | 74.2 |  |  | 74.0 |  |  | 80.0 |
Net income per share (1): |  |  |  |  |  |  |  |
Basic |  | $ | 3.42 |  |  | $ | 3.54 |  |  | $ | 3.53 |  |  | $ | 3.86 |
Diluted |  | $ | 3.41 |  |  | $ | 3.54 |  |  | $ | 3.53 |  |  | $ | 3.84 |
(1) | Basic and diluted net income per share are computed independently for each of the quarters presented. Therefore, the sum of quarterly basic and diluted per share information may not equal annual basic and diluted net income per share.

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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=51825399&loc=d3e1280-108306 + Details
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