Financial Data by Segment - Schedule of Revenues and Assets by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 1,531.6	$ 1,389.8	$ 1,054.9	$ 1,017.4	$ 1,361.9	$ 1,249.9	$ 968.7	$ 948.6	$ 4,993.7	$ 4,529.0	$ 4,362.2
Assets	8,119.8				4,889.8				8,119.8	4,889.8	3,880.7
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									4,370.4	3,989.7	3,913.8
Assets	4,885.2				3,783.2				4,885.2	3,783.2	2,870.2
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									360.1	341.6	279.5
Assets	549.0				479.2				549.0	479.2	504.8
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									243.5	179.1	148.5
Assets	2,430.6				500.6				2,430.6	500.6	397.6
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									19.7	18.7	20.3
Assets	$ 255.0				$ 126.7				$ 255.0	$ 126.7	$ 108.1