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Stock-Based Compensation - RSUs Outstanding (Details) - $ / shares shares in Thousands | 3 Months Ended | 12 Months Ended |
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Dec. 31, 2018 | Sep. 30, 2018 | Jul. 01, 2018 | Apr. 01, 2018 | Dec. 31, 2017 | Oct. 01, 2017 | Jul. 02, 2017 | Apr. 02, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair value assumptions |  |  |  |  |  |  |  |  |  |  |  |
Dividends distributed on the company's Common Stock (in dollars per share) | $ 0.21 | $ 0.21 | $ 0.21 | $ 0.19 | $ 0.19 | $ 0.19 | $ 0.19 | $ 0.18 | $ 0.82 | $ 0.75 | $ 0.71 |
Class A |  |  |  |  |  |  |  |  |  |  |  |
Fair value assumptions |  |  |  |  |  |  |  |  |  |  |  |
Dividends distributed on the company's Common Stock (in dollars per share) |  |  |  |  |  |  |  |  | 0.82 | 0.75 | 0.71 |
Class B |  |  |  |  |  |  |  |  |  |  |  |
Fair value assumptions |  |  |  |  |  |  |  |  |  |  |  |
Dividends distributed on the company's Common Stock (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.82 | $ 0.75 | $ 0.71 |
Management Stock Purchase Plan | Restricted stock units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |
RSUs Outstanding |  |  |  |  |  |  |  |  |  |  |  |
Number Outstanding (in shares) | 154 |  |  |  | 174 |  |  |  | 154 | 174 | 148 | 101
Weighted Average Purchase Price (in dollars per share) | $ 45.02 |  |  |  | $ 39.68 |  |  |  | $ 45.02 | $ 39.68 | $ 36.37 | $ 36.14
RSUs Vested |  |  |  |  |  |  |  |  |  |  |  |
Number Vested (in shares) | 66 |  |  |  | 57 |  |  |  | 66 | 57 | 28 |
Weighted Average Purchase Price (in dollars per share) | $ 38.17 |  |  |  | $ 36.26 |  |  |  | $ 38.17 | $ 36.26 | $ 37.78 |
Fair value assumptions |  |  |  |  |  |  |  |  |  |  |  |
Expected life (years) |  |  |  |  |  |  |  |  | 3 years | 3 years | 3 years |
Expected stock price volatility (as a percent) |  |  |  |  |  |  |  |  | 24.10% | 25.00% | 24.80% |
Expected dividend yield (as a percent) |  |  |  |  |  |  |  |  | 1.00% | 1.20% | 1.30% |
Risk-free interest rate (as a percent) |  |  |  |  |  |  |  |  | 2.40% | 1.50% | 0.90% |
Weighted average grant-date fair value (in dollars per share) |  |  |  |  |  |  |  |  | $ 21.80 | $ 16.84 | $ 18.15 |
$35.41-$40.27 | Management Stock Purchase Plan | Restricted stock units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |
Information about RSUs outstanding |  |  |  |  |  |  |  |  |  |  |  |
Low end of purchase price range (in dollars per share) |  |  |  |  |  |  |  |  | 35.41 |  |  |
High end of purchase price range (in dollars per share) |  |  |  |  |  |  |  |  | $ 40.27 |  |  |
RSUs Outstanding |  |  |  |  |  |  |  |  |  |  |  |
Number Outstanding (in shares) | 80 |  |  |  |  |  |  |  | 80 |  |  |
Weighted Average Purchase Price (in dollars per share) | $ 35.47 |  |  |  |  |  |  |  | $ 35.47 |  |  |
RSUs Vested |  |  |  |  |  |  |  |  |  |  |  |
Number Vested (in shares) | 54 |  |  |  |  |  |  |  | 54 |  |  |
Weighted Average Purchase Price (in dollars per share) | $ 35.50 |  |  |  |  |  |  |  | $ 35.50 |  |  |
$49.92-$61.84 | Management Stock Purchase Plan | Restricted stock units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |
Information about RSUs outstanding |  |  |  |  |  |  |  |  |  |  |  |
Low end of purchase price range (in dollars per share) |  |  |  |  |  |  |  |  | 49.92 |  |  |
High end of purchase price range (in dollars per share) |  |  |  |  |  |  |  |  | $ 61.84 |  |  |
RSUs Outstanding |  |  |  |  |  |  |  |  |  |  |  |
Number Outstanding (in shares) | 74 |  |  |  |  |  |  |  | 74 |  |  |
Weighted Average Purchase Price (in dollars per share) | $ 55.37 |  |  |  |  |  |  |  | $ 55.37 |  |  |
RSUs Vested |  |  |  |  |  |  |  |  |  |  |  |
Number Vested (in shares) | 12 |  |  |  |  |  |  |  | 12 |  |  |
Weighted Average Purchase Price (in dollars per share) | $ 49.92 |  |  |  |  |  |  |  | $ 49.92 |  |  |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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