Deferred Revenue and Performance Obligation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Deferred Revenue and Performance Obligation [Abstract]
Deferred Revenue, Revenue Recognized	$ 45.3	$ 48.8	$ 70.3	$ 84.0
Revenue, Remaining Performance Obligation, Amount	390.5		390.5
Revenue Remaining Performance Obligation, to be recognized within 12 months	$ 190.3		$ 190.3