Share-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions |
3 Months Ended |
|
Mar. 30, 2018 |
Mar. 31, 2017 |
Dec. 31, 2017 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Cash received from exercise of stock options |
$ 3.6
|
$ 7.5
|
|
| Amended And Restated Stock Incentive Plan |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Aggregate of common stock available for grant |
34.9
|
|
39.0
|
| Employee Stock Options |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Unrecognized share-based compensation expense on non-vested stock options |
$ 0.1
|
|
|
| Stock option, weighted average period for recognition |
4 months
|
|
|
| Total intrinsic value of stock options exercised |
$ 9.4
|
|
|
| Cash received from exercise of stock options |
$ 3.6
|
|
|
| Options pre-vesting forfeitures estimated |
11.00%
|
11.00%
|
|
| Restricted Stock Units |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Unrecognized share-based compensation expense on non-vested stock options |
$ 130.9
|
|
|
| Stock option, weighted average period for recognition |
1 year 11 months 23 days
|
|
|
| Options pre-vesting forfeitures estimated |
5.00%
|
5.00%
|
|
| Maximum award vesting period (in years) |
3 years
|
|
|
| Employee Stock Purchase Plan |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Aggregate of common stock available for grant |
8.0
|
|
8.0
|
| Less than $24.46 |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Exercise price range, upper range limit (in dollars per share) |
$ 24.46
|
|
|