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Accounting for Stock-based Compensation - Additional Information (Details) |  | 3 Months Ended | 12 Months Ended
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Apr. 04, 2018 shares | Mar. 31, 2015 PerformancePeriod | Dec. 31, 2018 USD ($) PerformancePeriod $ / shares shares | Dec. 31, 2017 USD ($) PerformancePeriod shares | Dec. 31, 2016 USD ($) PerformancePeriod shares | Dec. 31, 2015 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, options, outstanding, weighted average remaining contractual term |  |  | 4 years 8 months 12 days |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period |  |  | 3 years |  |  |
Share-based compensation arrangement by share-based payment award, options, vested in period, fair value | $ |  |  | $ 0 | $ 1,900,000 | $ 1,300,000 |
Share-based compensation arrangement by share-based payment award, options, vested and expected to vest, exercisable, weighted average remaining contractual term |  |  | 4 years 8 months 12 days |  |  |
Share-based compensation arrangement by share-based payment award, options, exercisable, weighted average remaining contractual term |  |  | 4 years 8 months 12 days |  |  |
Employee Stock Option |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, number of shares grants |  |  | 0 | 0 | 0 |
Share-based compensation arrangement by share-based payment award, options, outstanding, weighted average remaining contractual term |  |  | 10 years |  |  |
Share price | $ / shares |  |  | $ 64.78 |  |  |
Share-based compensation arrangement by share-based payment award, options, exercises in period, intrinsic value | $ |  |  | $ 8,300,000 | $ 4,500,000 | $ 2,500,000 |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share price | $ / shares |  |  | $ 64.78 |  |  |
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period, fair value | $ |  |  | $ 6,500,000 | $ 6,300,000 | $ 7,200,000 |
Number of shares, granted |  |  | 235,480 | 194,227 | 240,868 |
Number of shares, vested |  |  | 169,279 | 179,974 | 221,659 |
Cash Settled RSUs |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share price | $ / shares |  |  | $ 64.78 |  |  |
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period, fair value | $ |  |  | $ 7,700,000 | $ 6,900,000 | $ 5,900,000 |
Number of shares, granted |  |  | 147,103 | 174,419 | 233,790 |
Number of shares, vested |  |  | 147,759 | 161,576 | 146,619 |
Non-Employee Director Awards |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Employee service share-based compensation, nonvested awards, compensation not yet recognized, share-based awards other than options | $ |  |  | $ 0 |  |  |
Number of shares, granted |  |  | 7,985 | 13,861 | 15,299 |
Performance Shares |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share price | $ / shares |  |  | $ 64.78 |  |  |
Number of performance period in performance based share program | PerformancePeriod |  | 2 | 1 | 2 | 3 |
Percentage of multiplication award by product |  |  | 2.00% |  |  |
Number of shares, granted |  |  | 45,136 | 60,929 | 74,574 | 30,576
Number of shares, vested |  |  | 30,576 |  |  |
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected dividend rate |  |  | 0.90% | 0.00% | 0.00% |
Share-based compensation arrangement by share-based payment award, fair Value assumptions, expected volatility rate |  |  | 31.90% | 31.30% | 30.90% |
Share-based compensation arrangement by share-based payment award, fair value assumptions, risk free interest rate |  |  | 2.40% | 1.50% | 1.00% |
Minimum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected forfeiture rate |  |  | 0.00% |  |  |
Minimum | Employee Stock Option |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period |  |  | 3 years |  |  |
Minimum | Restricted Stock Units (RSUs) |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period |  |  | 3 years |  |  |
Minimum | Cash Settled RSUs |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period |  |  | 3 years |  |  |
Maximum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected forfeiture rate |  |  | 18.17% |  |  |
Maximum | Employee Stock Option |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period |  |  | 4 years |  |  |
Maximum | Restricted Stock Units (RSUs) |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period |  |  | 4 years |  |  |
Maximum | Cash Settled RSUs |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period |  |  | 4 years |  |  |
Omnibus Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, number of shares grants | 1,185,000 |  | 568,801 |  |  |
Share-based compensation arrangement by share-based payment award, number of additional awards |  |  | 0 |  |  |
Share-based compensation arrangement by share-based payment award, number of shares available for grant |  |  | 1,098,906 |  |  |
Share-based compensation arrangement by share-based payment award, options, outstanding, weighted average remaining contractual term |  |  | 5 years |  |  |
Omnibus Plan | Non-Employee Director Awards |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share price | $ / shares |  |  | $ 64.78 |  |  |
Number of shares, granted |  |  | 11,606 |  |  |
Number of shares, vested |  |  | 5,395 |  |  |

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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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