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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(1))
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

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Revenue from Contracts with Customers - Revenue by Service Offering (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue from Contracts with Customers
Total revenue	$ 289.7	$ 291.3	$ 576.9	$ 576.8
Subscription services
Revenue from Contracts with Customers
Revenue	266.4	269.8	531.6	533.3
HSD
Revenue from Contracts with Customers
Revenue	130.4	117.5	257.9	229.2
Video
Revenue from Contracts with Customers
Revenue	109.6	123.1	220.6	244.9
Telephony
Revenue from Contracts with Customers
Revenue	26.4	29.2	53.1	59.2
Other business services
Revenue from Contracts with Customers
Revenue	7.1	6.8	14.2	14.0
Other business services - Wholesale and colocation lease revenue
Revenue from Contracts with Customers
Revenue	5.4	5.2	10.9	11.0
Other services
Revenue from Contracts with Customers
Other revenue	16.2	14.7	31.1	29.5
Residential Subscription
Revenue from Contracts with Customers
Total revenue	232.1	237.2	463.6	469.3
Residential Subscription \| Subscription services
Revenue from Contracts with Customers
Revenue	232.1	237.2	463.6	469.3
Residential Subscription \| HSD
Revenue from Contracts with Customers
Revenue	110.5	99.0	218.6	193.3
Residential Subscription \| Video
Revenue from Contracts with Customers
Revenue	105.9	119.3	213.3	237.8
Residential Subscription \| Telephony
Revenue from Contracts with Customers
Revenue	15.7	18.9	31.7	38.2
Business Subscription
Revenue from Contracts with Customers
Total revenue	34.3	32.6	68.0	64.0
Business Subscription \| Subscription services
Revenue from Contracts with Customers
Revenue	34.3	32.6	68.0	64.0
Business Subscription \| HSD
Revenue from Contracts with Customers
Revenue	19.9	18.5	39.3	35.9
Business Subscription \| Video
Revenue from Contracts with Customers
Revenue	3.7	3.8	7.3	7.1
Business Subscription \| Telephony
Revenue from Contracts with Customers
Revenue	$ 10.7	$ 10.3	$ 21.4	$ 21.0