Revenue from Contracts with Customers - Services Length (Details)	12 Months Ended
	Dec. 31, 2019
Residential Subscription | Minimum
Revenue from Contracts with Customers
Subscription services, contract term	12 months
Business Subscription
Revenue from Contracts with Customers
Subscription services, contract term	30 months
Business Subscription | Maximum
Revenue from Contracts with Customers
Subscription services, contract term	24 months