Revenue from Contracts with Customers - Costs of Obtaining Contracts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Costs of Obtaining Contracts with Customers
Capitalized contract cost, Beginning of period	$ 31.8	$ 20.9	$ 6.5
Deferral	15.5	17.4	18.1
Amortization	(10.0)	(6.5)	(3.7)
Capitalized contract cost, End of period	37.3	31.8	20.9
Current costs of obtaining contracts with customers	14.1	3.6
Non-current costs of obtaining contracts with customers	23.2	28.2
Total costs of obtaining contracts with customers	$ 37.3	$ 31.8	$ 20.9
Minimum | Residential Subscription
Costs of Obtaining Contracts with Customers
Costs of contracts with customers, amortization period	3 years
Minimum | Business Subscription
Costs of Obtaining Contracts with Customers
Costs of contracts with customers, amortization period	5 years
Maximum | Residential Subscription
Costs of Obtaining Contracts with Customers
Costs of contracts with customers, amortization period	4 years
Maximum | Business Subscription
Costs of Obtaining Contracts with Customers
Costs of contracts with customers, amortization period	6 years