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Equity (Stock-based Compensation Plans) (Narrative) (Details) - USD ($) shares in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 02, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Vesting period |  | 4 years |  |
Weighted average remaining contractual life |  | 6 years 1 month 6 days |  |
Total intrinsic value of options exercised |  | $ 1.0 | $ 0.6 | $ 7.2
Unvested number of shares |  | 0.4 |  |
Unrecognized compensation cost |  | $ 3.9 |  |
Weighted average period over which unrecognized compensation cost will be recognized |  | 1 year 2 months 12 days |  |
Restricted Stock [Member] |  |  |  |
Value of equity classified RSUs vested |  | $ 7.4 |  |
Unrecognized compensation cost |  | $ 41.6 |  |
Weighted average period over which unrecognized compensation cost will be recognized |  | 2 years 7 months 6 days |  |
Employee Stock Option [Member] | Minimum [Member] |  |  |  |
Expected option term |  |  | 5 years 3 months 18 days | 5 years 1 month 6 days
Employee Stock Option [Member] | Maximum [Member] |  |  |  |
Expected option term |  |  | 5 years 6 months | 6 years
2012 Plan [Member] |  |  |  |
Expected option term |  | 10 years |  |
Equity Incentive Plan, shares authorized |  | 0.9 |  |
2012 Plan [Member] | Employee Stock Option [Member] | Minimum [Member] |  |  |  |
Vesting period |  | 2 years |  |
2012 Plan [Member] | Employee Stock Option [Member] | Maximum [Member] |  |  |  |
Vesting period |  | 4 years |  |
2012 Plan [Member] | Subsequent Event [Member] |  |  |  |
Equity Incentive Plan, number of additional shares authorized | 0.5 |  |  |

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