Goodwill and Intangible Assets - Components Of Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jun. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Original Cost	$ 485.4	$ 458.1
Accumulated Amortization	(252.7)	(232.2)
Intangible Assets, net	232.7	225.9
Software
Finite-Lived Intangible Assets [Line Items]
Original Cost	277.4	250.8
Accumulated Amortization	(141.5)	(126.7)
Intangible Assets, net	135.9	124.1
Customer lists
Finite-Lived Intangible Assets [Line Items]
Original Cost	197.3	196.6
Accumulated Amortization	(105.3)	(100.2)
Intangible Assets, net	92.0	96.4
Trademarks
Finite-Lived Intangible Assets [Line Items]
Original Cost	7.5	7.5
Accumulated Amortization	(3.4)	(3.1)
Intangible Assets, net	4.1	4.4
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Original Cost	3.2	3.2
Accumulated Amortization	(2.5)	(2.2)
Intangible Assets, net	$ 0.7	$ 1.0