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Share-based Compensation (Other than Options Award Activity) (Schedules) (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
RSUs |  |  |
Weighted average grant-date fair value per share |  |  |
Granted (in dollars per shares) | $ 24.66 | $ 28.72 | $ 31.24
RSUs | Class A |  |  |
Number of awards |  |  |
Outstanding at beginning of period (in shares) | 582,374 |  |
Granted (in shares) | 359,012 |  |
Forfeited (in shares) | (141,043) |  |
Released from restrictions (in shares) | (284,847) |  |
Outstanding at end of period (in shares) | 515,496 | 582,374 |
Weighted average grant-date fair value per share |  |  |
Outstanding at beginning of period (in dollars per shares) | $ 31.85 |  |
Granted (in dollars per shares) | 25.09 |  |
Forfeited (in dollars per share) | 30.23 |  |
Released from restrictions (in dollars per shares) | 31.34 |  |
Outstanding at end of period (in dollars per shares) | $ 27.86 | $ 31.85 |
Weighted average remaining contractual term |  |  |
Outstanding at end of period | 2 years 6 months |  |
RSUs | Class B |  |  |
Number of awards |  |  |
Outstanding at beginning of period (in shares) | 0 |  |
Granted (in shares) | 48,786 |  |
Outstanding at end of period (in shares) | 48,786 | 0 |
Weighted average grant-date fair value per share |  |  |
Outstanding at beginning of period (in dollars per shares) | $ 0 |  |
Granted (in dollars per shares) | 26.03 |  |
Outstanding at end of period (in dollars per shares) | $ 26.03 | $ 0 |
Weighted average remaining contractual term |  |  |
Outstanding at end of period | 2 months 12 days |  |
RSUs | Class C |  |  |
Number of awards |  |  |
Outstanding at beginning of period (in shares) | 1,162,351 |  |
Granted (in shares) | 718,024 |  |
Forfeited (in shares) | (281,767) |  |
Released from restrictions (in shares) | (572,598) |  |
Outstanding at end of period (in shares) | 1,026,010 | 1,162,351 |
Weighted average grant-date fair value per share |  |  |
Outstanding at beginning of period (in dollars per shares) | $ 31.02 |  |
Granted (in dollars per shares) | 24.35 |  |
Forfeited (in dollars per share) | 30.32 |  |
Released from restrictions (in dollars per shares) | 30.29 |  |
Outstanding at end of period (in dollars per shares) | $ 26.95 | $ 31.02 |
Weighted average remaining contractual term |  |  |
Outstanding at end of period | 2 years 6 months |  |
RSAs |  |  |
Weighted average grant-date fair value per share |  |  |
Granted (in dollars per shares) | $ 25.29 | $ 0 | 0
RSAs | Class B |  |  |
Number of awards |  |  |
Outstanding at beginning of period (in shares) | 0 |  |
Granted (in shares) | 670,000 |  |
Forfeited (in shares) | (670,000) |  |
Outstanding at end of period (in shares) | 0 | 0 |
Weighted average grant-date fair value per share |  |  |
Outstanding at beginning of period (in dollars per shares) | $ 0 |  |
Granted (in dollars per shares) | 25.29 |  |
Forfeited (in dollars per share) | 25.29 |  |
Outstanding at end of period (in dollars per shares) | 0 | $ 0 |
PSUs |  |  |
Weighted average grant-date fair value per share |  |  |
Granted (in dollars per shares) | $ 25.00 | $ 23.60 | $ 26.59
PSUs | Class A |  |  |
Number of awards |  |  |
Outstanding at beginning of period (in shares) | 2,904,644 |  |
Granted (in shares) | 2,502,764 |  |
Forfeited (in shares) | (548,237) |  |
Released from restrictions (in shares) | (1,416,391) |  |
Impact of the sale of the Vodafone Disposal Group (in shares) | (54,409) |  |
Outstanding at end of period (in shares) | 3,388,371 | 2,904,644 |
Weighted average grant-date fair value per share |  |  |
Outstanding at beginning of period (in dollars per shares) | $ 28.22 |  |
Granted (in dollars per shares) | 25.44 |  |
Forfeited (in dollars per share) | 28.58 |  |
Released from restrictions (in dollars per shares) | 31.04 |  |
Impact of the sale of the Vodafone Disposal Group (in dollars per share) | 24.03 |  |
Outstanding at end of period (in dollars per shares) | $ 25.00 | $ 28.22 |
Weighted average remaining contractual term |  |  |
Outstanding at end of period | 1 year 7 months 6 days |  |
PSUs | Class B |  |  |
Number of awards |  |  |
Outstanding at beginning of period (in shares) | 0 |  |
Granted (in shares) | 1,330,000 |  |
Outstanding at end of period (in shares) | 1,330,000 | 0 |
Weighted average grant-date fair value per share |  |  |
Outstanding at beginning of period (in dollars per shares) | $ 0 |  |
Granted (in dollars per shares) | 25.29 |  |
Outstanding at end of period (in dollars per shares) | $ 25.29 | $ 0 |
Weighted average remaining contractual term |  |  |
Outstanding at end of period | 10 months 24 days |  |
PSUs | Class C |  |  |
Number of awards |  |  |
Outstanding at beginning of period (in shares) | 5,814,437 |  |
Granted (in shares) | 5,005,528 |  |
Forfeited (in shares) | (1,098,252) |  |
Released from restrictions (in shares) | (2,836,847) |  |
Impact of the sale of the Vodafone Disposal Group (in shares) | (108,818) |  |
Outstanding at end of period (in shares) | 6,776,048 | 5,814,437 |
Weighted average grant-date fair value per share |  |  |
Outstanding at beginning of period (in dollars per shares) | $ 27.39 |  |
Granted (in dollars per shares) | 24.69 |  |
Forfeited (in dollars per share) | 27.71 |  |
Released from restrictions (in dollars per shares) | 30.06 |  |
Impact of the sale of the Vodafone Disposal Group (in dollars per share) | 23.41 |  |
Outstanding at end of period (in dollars per shares) | $ 24.29 | $ 27.39 |
Weighted average remaining contractual term |  |  |
Outstanding at end of period | 1 year 7 months 6 days |  |
Former Employees | RSUs | Class A |  |  |
Number of awards |  |  |
Outstanding at end of period (in shares) | 3,969 |  |
Weighted average grant-date fair value per share |  |  |
Outstanding at end of period (in dollars per shares) | $ 33.23 |  |
Weighted average remaining contractual term |  |  |
Outstanding at end of period | 1 year 3 months 18 days |  |
Former Employees | RSUs | Class C |  |  |
Number of awards |  |  |
Outstanding at end of period (in shares) | 7,923 |  |
Weighted average grant-date fair value per share |  |  |
Outstanding at end of period (in dollars per shares) | $ 32.33 |  |
Weighted average remaining contractual term |  |  |
Outstanding at end of period | 1 year 3 months 18 days |  |
Former Employees | PSUs | Class A |  |  |
Number of awards |  |  |
Outstanding at end of period (in shares) | 54,990 |  |
Weighted average grant-date fair value per share |  |  |
Outstanding at end of period (in dollars per shares) | $ 24.05 |  |
Weighted average remaining contractual term |  |  |
Outstanding at end of period | 24 days |  |
Former Employees | PSUs | Class C |  |  |
Number of awards |  |  |
Outstanding at end of period (in shares) | 109,980 |  |
Weighted average grant-date fair value per share |  |  |
Outstanding at end of period (in dollars per shares) | $ 23.44 |  |
Weighted average remaining contractual term |  |  |
Outstanding at end of period | 24 days |  |

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