Segment Reporting (Revenue by Major Category) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Revenue	$ 1,853.3	$ 3,499.9
Total residential fixed revenue
Segment Reporting Information [Line Items]
Revenue	776.2	1,986.1
Total subscription revenue
Segment Reporting Information [Line Items]
Revenue	750.6	1,930.3
Broadband internet
Segment Reporting Information [Line Items]
Revenue	360.2	902.8
Video
Segment Reporting Information [Line Items]
Revenue	286.5	674.4
Fixed-line telephony
Segment Reporting Information [Line Items]
Revenue	103.9	353.1
Non-subscription revenue
Segment Reporting Information [Line Items]
Revenue	25.6	55.8
Total residential revenue
Segment Reporting Information [Line Items]
Revenue	1,274.7	2,746.8
Total residential mobile revenue
Segment Reporting Information [Line Items]
Revenue	498.5	760.7
Subscription revenue
Segment Reporting Information [Line Items]
Revenue	353.2	480.5
Non-subscription revenue
Segment Reporting Information [Line Items]
Revenue	145.3	280.2
Total B2B revenue
Segment Reporting Information [Line Items]
Revenue	354.3	589.5
Subscription revenue
Segment Reporting Information [Line Items]
Revenue	132.9	178.7
Non-subscription revenue
Segment Reporting Information [Line Items]
Revenue	221.4	410.8
Other revenue
Segment Reporting Information [Line Items]
Revenue	$ 224.3	$ 163.6