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Earnings per Share and Stock Repurchase Program (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) $ / shares shares | Sep. 27, 2020 USD ($) $ / shares | Jun. 28, 2020 USD ($) $ / shares | Mar. 29, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares | Sep. 29, 2019 USD ($) $ / shares | Jun. 30, 2019 USD ($) $ / shares | Mar. 31, 2019 USD ($) $ / shares | Dec. 31, 2020 USD ($) item $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Feb. 06, 2019 USD ($) | Jul. 27, 2015 USD ($)
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock conversion ratio, at the option of the holder |  |  |  |  |  |  |  |  | 1 |  |  |  |
Net (loss) income |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 29.2 | $ 32.9 | $ 20.2 | $ 32.0 | $ 31.8 | $ 32.3 | $ 36.4 | $ 31.0 | $ 114.3 | $ 131.5 | $ 128.0 |  |
Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Shares (in shares) | shares |  |  |  |  |  |  |  |  | 33,900,000 | 34,100,000 | 34,300,000 |  |
Per Share Amount |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (in dollars per share) | $ / shares | $ 0.86 | $ 0.97 | $ 0.60 | $ 0.94 | $ 0.94 | $ 0.95 | $ 1.06 | $ 0.91 | $ 3.37 | $ 3.86 | $ 3.73 |  |
Dilutive securities, principally common stock options |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock equivalents (in shares) | shares |  |  |  |  |  |  |  |  |  | 100,000 |  |  |
Common stock equivalents (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ (0.01) | $ (0.01) |  |  |
Net (loss) income |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | $ 114.3 | $ 131.5 | $ 128.0 |  |
Weighted average number of shares: |  |  |  |  |  |  |  |  |  |  |  |  |
Shares (in shares) | shares |  |  |  |  |  |  |  |  | 34,000,000.0 | 34,200,000 | 34,300,000 |  |
Securities not included in the computation of diluted EPS |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (in dollars per share) | $ / shares | $ 0.86 | $ 0.97 | $ 0.59 | $ 0.94 | $ 0.93 | $ 0.94 | $ 1.06 | $ 0.91 | $ 3.36 | $ 3.85 | $ 3.73 |  |
Shares repurchased |  |  |  |  |  |  |  |  |  |  |  |  |
Number of repurchase plans | item |  |  |  |  |  |  |  |  | 2 |  |  |  |
Cost of shares repurchased |  |  |  |  |  |  |  |  | $ 28.9 | $ 19.5 | $ 26.0 |  |
Class A |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, votes per share (Number of votes) | 1 |  |  |  | 1 |  |  |  | 1 | 1 |  |  |
Shares of Common Stock reserved for issuance under stock-based compensation plans | shares | 2,252,875 |  |  |  |  |  |  |  | 2,252,875 |  |  |  |
Shares repurchased |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares repurchased | shares |  |  |  |  |  |  |  |  | 331,531 | 227,620 |  |  |
Cost of shares repurchased |  |  |  |  |  |  |  |  | $ 28.9 | $ 19.5 |  |  |
Class B |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, votes per share (Number of votes) | 10 |  |  |  | 10 |  |  |  | 10 | 10 |  |  |
Shares of Common Stock reserved for conversion | shares | 6,144,290 |  |  |  |  |  |  |  | 6,144,290 |  |  |  |
July 27, 2015 | Class A |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares of the entity's Class A common stock authorized to be repurchased |  |  |  |  |  |  |  |  |  |  |  |  | $ 100.0
Number of shares repurchased | shares |  |  |  |  |  |  |  |  |  | 146,304 |  |  |
Cost of shares repurchased |  |  |  |  |  |  |  |  |  | $ 11.8 |  |  |
February 6, 2019 | Class A |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares of the entity's Class A common stock authorized to be repurchased |  |  |  |  |  |  |  |  |  |  |  | $ 150.0 |
Number of shares repurchased | shares |  |  |  |  |  |  |  |  | 331,531 | 81,316 |  |  |
Cost of shares repurchased |  |  |  |  |  |  |  |  | $ 28.9 | $ 7.7 |  |  |
Remaining authorized repurchase amount | $ 113.4 |  |  |  |  |  |  |  | $ 113.4 |  |  |  |

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1448-109256 + Details
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- Definition Shares of common stock reserved for conversion. + References No definition available. + Details
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- Definition Represents the conversion ratio of common stock at the option of the holder. + References No definition available. + Details
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- Definition There is no established public trading market for our Class B Common Stock, which is held exclusively by members of the Horne family. The principal holders of such stock are subject to restrictions on transfer with respect to their shares. Each share of our Class B Common Stock (10 votes per share) is convertible into one share of Class A Common Stock (1 vote per share). + References No definition available. + Details
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- Definition Adjustment to earnings per share for dilutive potential common shares or units. + References No definition available. + Details
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