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Stock-Based Compensation (Narrative) (Details) shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) shares
Stock options |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Shares reserved for future issuance (in shares) | shares | 2.6
Time-vested restricted stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period (in years) for shares awarded | 3 years
Performance-based shares |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period (in years) for shares awarded | 3 years
Award vesting period | 3 years
Level of performance achieved based on shares awarded, minimum | 0.00%
Level of performance achieved based on shares awarded, maximum | 200.00%
Time-vested restricted stock and deferred stock | Minimum |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Award vesting period | 3 years
Time-vested restricted stock and deferred stock | Maximum |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Award vesting period | 5 years
Restricted stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Unrecognized compensation cost | $ 67
Weighted average recognition period, in years | 2 years 8 months 12 days
Aggregate market value of the shares released and issued on the vesting dates | $ 26

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