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Stock Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
RSUs | Ratably |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
RSUs | Cliff |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 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) | $ 77.67 | $ 39.79 | $ 54.64
Total fair value of awards that vested | $ 15.4 | $ 8.9 | $ 14.5
Total unrecognized stock compensation expense | $ 13.6 |  |
Weighted average period to recognize unrecognized compensation cost | 1 year 9 months 7 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) | $ 71.88 | $ 40.61 | $ 52.46
Total fair value of awards that vested | $ 22.7 | $ 11.5 | $ 20.7
Total unrecognized stock compensation expense | $ 24.4 |  |
Weighted average period to recognize unrecognized compensation cost | 1 year 9 months 29 days |  |
2016 Stock Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock, shares authorized (in shares) | 17.1 |  |
Shares available (in shares) | 5.4 |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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=120381028&loc=d3e5070-113901 + Details
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