Revenue from Contracts with Customers - Costs of Obtaining Contracts (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Revenue from Contracts with Customers
Capitalized contract cost, Beginning of period	$ 37.7	$ 33.8	$ 37.3	$ 31.8
Deferral	4.0	3.9	7.8	7.9
Amortization	(3.5)	(2.3)	(6.9)	(4.3)
Capitalized contract cost, End of period	38.2	35.4	38.2	35.4
Current costs of obtaining contracts with customers	15.0		15.0		$ 14.1
Non-current costs of obtaining contracts with customers	23.2		23.2		23.2
Total costs of obtaining contracts with customers	$ 38.2	$ 35.4	$ 38.2	$ 35.4	$ 37.3