Revenue from Contracts with Customers - Costs of Obtaining Contracts (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Revenue from Contracts with Customers
Capitalized contract cost, Beginning of period	$ 38.2	$ 35.4	$ 37.3	$ 31.8
Deferral	4.6	4.3	12.4	12.2
Amortization	(3.7)	(2.7)	(10.6)	(7.0)
Capitalized contract cost, End of period	39.1	37.0	39.1	37.0
Current costs of obtaining contracts with customers	15.4		15.4		$ 14.1
Non-current costs of obtaining contracts with customers	23.7		23.7		23.2
Total costs of obtaining contracts with customers	$ 39.1	$ 37.0	$ 39.1	$ 37.0	$ 37.3