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Revenue from Contracts with Customers - Unsatisfied Performance Obligations Amount (Details) $ in Millions	Sep. 30, 2024 USD ($)
Business subscription services and other business services
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 101.3
Business subscription services
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	97.3
Other business services
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 4.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01 | Residential subscription | Maximum
Unsatisfied Performance Obligations
Expected period to recognize revenue of remaining performance obligations	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01 | Business subscription services and other business services
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 17.1
Expected period to recognize revenue of remaining performance obligations	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01 | Business subscription services
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 16.4
Expected period to recognize revenue of remaining performance obligations	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01 | Other business services
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 0.7
Expected period to recognize revenue of remaining performance obligations	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | Business subscription services and other business services
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 47.5
Expected period to recognize revenue of remaining performance obligations	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | Business subscription services
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 45.6
Expected period to recognize revenue of remaining performance obligations	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | Other business services
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 1.9
Expected period to recognize revenue of remaining performance obligations	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 | Business subscription services and other business services
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 24.0
Expected period to recognize revenue of remaining performance obligations	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 | Business subscription services
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 23.0
Expected period to recognize revenue of remaining performance obligations	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 | Other business services
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 1.0
Expected period to recognize revenue of remaining performance obligations	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 | Business subscription services and other business services
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 12.7
Expected period to recognize revenue of remaining performance obligations
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 | Business subscription services
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 12.3
Expected period to recognize revenue of remaining performance obligations
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 | Other business services
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 0.4
Expected period to recognize revenue of remaining performance obligations

X

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (a)
-SubTopic 10
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-13

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- Definition

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+ References

No definition available.

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- Definition

Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-SubTopic 10
-Topic 606
-Publisher FASB
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