Revenue from Contracts with Customers - Unsatisfied Performance Obligations Amount (Details) $ in Millions	Dec. 31, 2021 USD ($)
Business Subscription
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 75.3
Subscription services | Business Subscription
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	69.9
Other business services | Business Subscription
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 5.4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 | 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]: 2022-01-01 | Business Subscription
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 42.5
Expected period to recognize revenue of remaining performance obligations	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 | Subscription services | Business Subscription
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 39.2
Expected period to recognize revenue of remaining performance obligations	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 | Other business services | Business Subscription
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 3.3
Expected period to recognize revenue of remaining performance obligations	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 | Business Subscription
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 21.7
Expected period to recognize revenue of remaining performance obligations	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 | Subscription services | Business Subscription
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 20.2
Expected period to recognize revenue of remaining performance obligations	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 | Other business services | Business Subscription
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 1.5
Expected period to recognize revenue of remaining performance obligations	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | Business Subscription
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 8.6
Expected period to recognize revenue of remaining performance obligations	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | Subscription services | Business Subscription
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 8.0
Expected period to recognize revenue of remaining performance obligations	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | Other business services | Business Subscription
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 0.6
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 | Business Subscription
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 2.5
Expected period to recognize revenue of remaining performance obligations
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | Subscription services | Business Subscription
Unsatisfied Performance Obligations
Expected revenue to be recognized in future periods	$ 2.5
Expected period to recognize revenue of remaining performance obligations
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | Other business services | Business Subscription
Unsatisfied Performance Obligations
Expected period to recognize revenue of remaining performance obligations