Share-based Compensation (Stock Award Activity, Options, SARs & PSARs) (Schedules) (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) $ / shares shares
Options | Class A
Number of awards
Options outstanding at beginning of period (in shares) | shares	580,518
Options granted (in shares) | shares	50,121
Options expired, cancelled or forfeited (in shares) | shares	(10,447)
Options exercised (in shares) | shares	(11,934)
Options outstanding at end of period (in shares) | shares	608,258
Options exercisable and end of period (in shares) | shares	510,074
Weighted average exercise or base price
Options outstanding at beginning of period (in dollars per shares) | $ / shares	$ 30.38
Options granted (in dollars per shares) | $ / shares	22.04
Options expired, cancelled or forfeited (in dollars per shares) | $ / shares	24.48
Options exercised (in dollars per share) | $ / shares	19.28
Options outstanding at end of period (in dollars per shares) | $ / shares	30.02
Options exercisable at end of period (in dollars per share) | $ / shares	$ 31.25
Weighted average remaining contractual term
Options outstanding at end of period	3 years 8 months 12 days
Options exercisable at end of period	2 years 8 months 12 days
Aggregate intrinsic value
Options outstanding at end of period | $	$ 0.0
Options exercisable at end of period | $	$ 0.0
Options | Class C
Number of awards
Options outstanding at beginning of period (in shares) | shares	2,244,752
Options granted (in shares) | shares	297,787
Options expired, cancelled or forfeited (in shares) | shares	(22,925)
Options exercised (in shares) | shares	(54,320)
Options outstanding at end of period (in shares) | shares	2,465,294
Options exercisable and end of period (in shares) | shares	1,787,439
Weighted average exercise or base price
Options outstanding at beginning of period (in dollars per shares) | $ / shares	$ 25.76
Options granted (in dollars per shares) | $ / shares	25.32
Options expired, cancelled or forfeited (in dollars per shares) | $ / shares	24.13
Options exercised (in dollars per share) | $ / shares	20.46
Options outstanding at end of period (in dollars per shares) | $ / shares	25.84
Options exercisable at end of period (in dollars per share) | $ / shares	$ 26.75
Weighted average remaining contractual term
Options outstanding at end of period	5 years 2 months 12 days
Options exercisable at end of period	4 years
Aggregate intrinsic value
Options outstanding at end of period | $	$ 1.7
Options exercisable at end of period | $	$ 1.1
SARs | Class A
Number of awards
Options outstanding at beginning of period (in shares) | shares	21,077,203
Options granted (in shares) | shares	1,481,151
Options expired, cancelled or forfeited (in shares) | shares	(1,025,686)
Options exercised (in shares) | shares	(300,588)
Options impact of the sale of UPC Poland (in shares) | shares	(48,440)
Options outstanding at end of period (in shares) | shares	21,183,640
Options exercisable and end of period (in shares) | shares	14,135,730
Weighted average exercise or base price
Options outstanding at beginning of period (in dollars per shares) | $ / shares	$ 27.05
Options granted (in dollars per shares) | $ / shares	25.79
Options expired, cancelled or forfeited (in dollars per shares) | $ / shares	29.39
Options exercised (in dollars per share) | $ / shares	17.37
Options impact of dispositions ( in dollar per shares) | $ / shares	28.20
Options outstanding at end of period (in dollars per shares) | $ / shares	26.98
Options exercisable at end of period (in dollars per share) | $ / shares	$ 28.52
Weighted average remaining contractual term
Options outstanding at end of period	4 years 10 months 24 days
Options exercisable at end of period	3 years 3 months 18 days
Aggregate intrinsic value
Options outstanding at end of period | $	$ 10.2
Options exercisable at end of period | $	$ 6.3
SARs | Class C
Number of awards
Options outstanding at beginning of period (in shares) | shares	49,605,813
Options granted (in shares) | shares	2,962,302
Options expired, cancelled or forfeited (in shares) | shares	(2,023,151)
Options exercised (in shares) | shares	(675,795)
Options impact of the sale of UPC Poland (in shares) | shares	(91,011)
Options outstanding at end of period (in shares) | shares	49,778,158
Options exercisable and end of period (in shares) | shares	30,354,881
Weighted average exercise or base price
Options outstanding at beginning of period (in dollars per shares) | $ / shares	$ 26.18
Options granted (in dollars per shares) | $ / shares	26.26
Options expired, cancelled or forfeited (in dollars per shares) | $ / shares	28.65
Options exercised (in dollars per share) | $ / shares	17.24
Options impact of dispositions ( in dollar per shares) | $ / shares	27.60
Options outstanding at end of period (in dollars per shares) | $ / shares	26.20
Options exercisable at end of period (in dollars per share) | $ / shares	$ 27.45
Weighted average remaining contractual term
Options outstanding at end of period	5 years 1 month 6 days
Options exercisable at end of period	3 years 1 month 6 days
Aggregate intrinsic value
Options outstanding at end of period | $	$ 30.3
Options exercisable at end of period | $	$ 18.7
PSARs | Class A
Number of awards
Options outstanding at beginning of period (in shares) | shares	3,352,572
Options expired, cancelled or forfeited (in shares) | shares	(56,710)
Options exercised (in shares) | shares	(591)
Options impact of the sale of UPC Poland (in shares) | shares	(13,460)
Options outstanding at end of period (in shares) | shares	3,281,811
Options exercisable and end of period (in shares) | shares	3,281,811
Weighted average exercise or base price
Options outstanding at beginning of period (in dollars per shares) | $ / shares	$ 25.97
Options expired, cancelled or forfeited (in dollars per shares) | $ / shares	25.97
Options exercised (in dollars per share) | $ / shares	25.97
Options impact of dispositions ( in dollar per shares) | $ / shares	25.97
Options outstanding at end of period (in dollars per shares) | $ / shares	25.97
Options exercisable at end of period (in dollars per share) | $ / shares	$ 25.97
Weighted average remaining contractual term
Options outstanding at end of period	6 years 2 months 12 days
Options exercisable at end of period	6 years 2 months 12 days
Aggregate intrinsic value
Options outstanding at end of period | $	$ 0.0
Options exercisable at end of period | $	$ 0.0
PSARs | Class C
Number of awards
Options outstanding at beginning of period (in shares) | shares	6,705,149
Options expired, cancelled or forfeited (in shares) | shares	(107,513)
Options exercised (in shares) | shares	(153,683)
Options impact of the sale of UPC Poland (in shares) | shares	(26,920)
Options outstanding at end of period (in shares) | shares	6,417,033
Options exercisable and end of period (in shares) | shares	6,417,033
Weighted average exercise or base price
Options outstanding at beginning of period (in dollars per shares) | $ / shares	$ 25.22
Options expired, cancelled or forfeited (in dollars per shares) | $ / shares	25.22
Options exercised (in dollars per share) | $ / shares	25.22
Options impact of dispositions ( in dollar per shares) | $ / shares	25.22
Options outstanding at end of period (in dollars per shares) | $ / shares	25.22
Options exercisable at end of period (in dollars per share) | $ / shares	$ 25.22
Weighted average remaining contractual term
Options outstanding at end of period	6 years 2 months 12 days
Options exercisable at end of period	6 years 2 months 12 days
Aggregate intrinsic value
Options outstanding at end of period | $	$ 0.0
Options exercisable at end of period | $	$ 0.0
Options, SARs and PSARs | Class A | Former Employees
Number of awards
Options outstanding at end of period (in shares) | shares	1,621,675
Options exercisable and end of period (in shares) | shares	1,546,159
Weighted average exercise or base price
Options outstanding at end of period (in dollars per shares) | $ / shares	$ 31.58
Options exercisable at end of period (in dollars per share) | $ / shares	$ 32.03
Weighted average remaining contractual term
Options outstanding at end of period	1 year 10 months 24 days
Options exercisable at end of period	1 year 7 months 6 days
Aggregate intrinsic value
Options outstanding at end of period | $	$ 0.2
Options exercisable at end of period | $	$ 0.1
Options, SARs and PSARs | Class C | Former Employees
Number of awards
Options outstanding at end of period (in shares) | shares	3,651,358
Options exercisable and end of period (in shares) | shares	3,500,357
Weighted average exercise or base price
Options outstanding at end of period (in dollars per shares) | $ / shares	$ 29.96
Options exercisable at end of period (in dollars per share) | $ / shares	$ 30.31
Weighted average remaining contractual term
Options outstanding at end of period	2 years 1 month 6 days
Options exercisable at end of period	1 year 10 months 24 days
Aggregate intrinsic value
Options outstanding at end of period | $	$ 0.7
Options exercisable at end of period | $	$ 0.4