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Share-based Compensation (Other than Options Award Activity) (Schedules) (Details) - $ / shares	12 Months Ended
	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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