Revenue - Changes in Customer Deposits (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Movement in Liability for Customer Deposits [Roll Forward]
Balance at the beginning of the year	$ 19.6	$ 24.6
Customer deposits acquired in Poppin acquisition	2.0	0.0
Increases due to deposits received, net of other adjustments	82.3	105.4
Revenue recognized	(79.5)	(110.4)
Balance at the end of the year	$ 24.4	$ 19.6