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Net Income Per Share (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Earnings Per Share [Abstract] |  |  |
Net income, as reported, for basic net income per share | $ 95.6 | $ 127.1 | $ 112.3
Weighted average common shares outstanding (in shares) | 72,000,000 | 70,900,000 | 69,600,000
Assumed stock options exercised and awards vested, based on the treasury stock method (in shares) | 1,800,000 | 1,900,000 | 1,700,000
Assumed conversion of convertible debt, based on the if-converted method (in shares) | 0 | 0 | 100,000
Weighted average shares assuming dilution (in shares) | 73,800,000 | 72,800,000 | 71,400,000
Antidilutive options excluded from computation of diluted net income per share (in shares) | 700,000 | 500,000 |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | 700,000 |  |

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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 40 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1930-109256 + Details
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