Intangible Assets (Schedule of Identifiable Acquisition Related Intangible Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Jun. 30, 2017
Schedule Of Intangible Assets Net Excluding Goodwill [Line Items]
Gross Carrying Amount	$ 1,484.8	$ 1,479.3
Accumulated Amortization	(332.8)	(309.0)
Total Net	1,152.0	1,170.3
Intangible Assets, Gross (Excluding Goodwill)	1,503.6	1,497.6
Intangible Assets, Net	1,170.8	1,188.6
Certifications [Member]
Schedule Of Intangible Assets Net Excluding Goodwill [Line Items]
Gross Carrying Amount, Indefinite-lived Intangibles	3.5	3.5
Indefinite-Lived Underlying Rights [Member]
Schedule Of Intangible Assets Net Excluding Goodwill [Line Items]
Gross Carrying Amount, Indefinite-lived Intangibles	15.3	14.8
Customer relationships [Member]
Schedule Of Intangible Assets Net Excluding Goodwill [Line Items]
Gross Carrying Amount	1,483.2	1,477.7
Accumulated Amortization	(332.3)	(308.6)
Total Net	1,150.9	1,169.1
Finite-Lived Underlying rights [Member]
Schedule Of Intangible Assets Net Excluding Goodwill [Line Items]
Gross Carrying Amount	1.6	1.6
Accumulated Amortization	(0.5)	(0.4)
Total Net	$ 1.1	$ 1.2