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Quarterly Financial Data | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Data | QUARTERLY FINANCIAL DATA (unaudited) 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 The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e765-108305 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e725-108305 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a + Details
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