Quarterly Financial Data (unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Quarterly Financial Information Disclosure [Abstract]
Total revenue	$ 607.1	$ 524.6	$ 466.3	$ 228.0	$ 223.3	$ 316.7	$ 262.9	$ 112.1	$ 1,825.9	$ 915.0	$ 435.0
Gross profit	288.8	245.8	197.1	105.1	100.1	120.6	111.3	51.5	836.7	383.6	189.6
Income (loss) from operations	90.0	(58.4)	(61.5)	(50.9)	(49.4)	(41.4)	(56.0)	(55.6)	(80.8)	(202.3)	(47.5)
Net income (loss)	$ 89.1	$ (55.6)	$ (55.4)	$ (49.8)	$ (47.4)	$ (38.6)	$ (55.1)	$ (54.5)	$ (71.6)	$ (195.6)	$ (47.9)
Net income (loss) per share attributable to common stockholders, basic (in dollars per share)	$ 0.31	$ (0.20)	$ (0.20)	$ (1.29)					$ (0.32)
Net income (loss) per share attributable to common stockholders, diluted (in dollars per share)	$ 0.27	$ (0.20)	$ (0.20)	$ (1.29)					(0.32)
Net income (loss) per share attributable to common stockholders, basic and diluted (in dollars per share)					$ (2.07)	$ (1.76)	$ (4.83)	$ (2.18)	$ (0.32)	$ (10.72)	$ (2.18)