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Earnings per Share and Stock Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Oct. 01, 2017 | Sep. 30, 2018 | Oct. 01, 2017 | Jul. 27, 2015
Net (loss) income |  |  |  |  |
Net income | $ 31.5 | $ 26.5 | $ 95.7 | $ 75.4 |
Shares |  |  |  |  |
Shares (in shares) | 34,300,000 | 34,400,000 | 34,300,000 | 34,400,000 |
Per Share Amount |  |  |  |  |
Net income (in dollars per share) | $ 0.92 | $ 0.77 | $ 2.79 | $ 2.19 |
Dilutive securities, principally common stock options |  |  |  |  |
Common stock equivalents (in shares) | 100,000 |  | 100,000 | 100,000 |
Common stock equivalents (in dollars per share) |  |  | $ (0.01) |  |
Net (loss) income |  |  |  |  |
Net income | $ 31.5 | $ 26.5 | $ 95.7 | $ 75.4 |
Weighted average number of shares: |  |  |  |  |
Shares (in shares) | 34,400,000 | 34,400,000 | 34,400,000 | 34,500,000 |
Securities not included in the computation of diluted EPS |  |  |  |  |
Net income (in dollars per share) | $ 0.92 | $ 0.77 | $ 2.78 | $ 2.19 |
Dilutive securities, principally common stock options |  |  |  |  |
Options to purchase shares of Class A common stock, anti-dilutive | 0 | 100,000 | 0 | 100,000 |
Shares repurchased |  |  |  |  |
Number of shares repurchased | 57,156 | 72,669 | 195,790 | 214,455 |
Cost of shares repurchased | $ 4.7 | $ 4.7 | $ 15.5 | $ 13.6 |
Class A |  |  |  |  |
Shares repurchased |  |  |  |  |
Total value of shares of the entity's Class A common stock authorized to be repurchased |  |  |  |  | $ 100.0
Remaining authorized repurchase amount | $ 22.3 |  | $ 22.3 |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + 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 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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