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Net Income Per Share (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Numerator (basic and diluted): |  |  |  |
Net income | $ 26.0 | $ 23.4 | $ 47.1 | $ 42.2
Less: Dividends paid to participating securities | 0.0 | 0.0 | (0.1) | (0.2)
Less: Undistributed earnings available to participating securities | (0.2) | (0.3) | (0.2) | (0.3)
Undistributed and distributed earnings available to common stockholders | $ 25.8 | $ 23.1 | $ 46.8 | $ 41.7
Denominator: |  |  |  |
Average number of common shares outstanding (in shares) | 30,313,200 | 30,274,300 | 30,304,100 | 30,226,600
Effect of dilutive stock-based compensation (in shares) | 134,500 | 122,700 | 131,100 | 118,800
Average number of common and potential common shares outstanding (in shares) | 30,447,700 | 30,397,000 | 30,435,200 | 30,345,400
Anti-dilutive stock options (in shares) |  | 0 |  |

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- Definition The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -URI http://asc.fasb.org/extlink&oid=64863997&loc=SL5780133-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60A -URI http://asc.fasb.org/extlink&oid=64863997&loc=SL5780132-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e2740-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 66 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e2814-109256 + Details
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