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Stock Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares outstanding other than RSUs (in shares) | 0 | 0 | 0
RSUs | Ratably |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
RSUs | Cliff | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
RSUs | Cliff | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 5 years |  |
Performance-Based RSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted-average fair value of awards granted (in dollars per share) | $ 54.64 | $ 70.13 | $ 56.59
Total fair value of awards that vested | $ 14.5 | $ 16.2 | $ 13.0
Total unrecognized stock compensation expense | $ 13.9 |  |
Weighted average period to recognize unrecognized compensation cost | 1 year 9 months 21 days |  |
Performance-Based RSUs | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of target award available for grant | 0.00% |  |
Performance-Based RSUs | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of target award available for grant | 200.00% |  |
Performance-Based RSUs | Cliff |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Time-Based RSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted-average fair value of awards granted (in dollars per share) | $ 52.46 | $ 66.86 | $ 55.28
Total fair value of awards that vested | $ 20.7 | $ 23.1 | $ 17.2
Total unrecognized stock compensation expense | $ 23.3 |  |
Weighted average period to recognize unrecognized compensation cost | 1 year 8 months 19 days |  |
2016 Stock Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock, shares authorized (in shares) | 14,000,000.0 |  |
Shares available (in shares) | 3,500,000 |  |

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