Derivatives and Hedging Activities - Schedule of changes in AOCI associated with derivative hedging activities (Details) - Cash flow hedges - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
(Losses) gains related to cash flow hedges
Balance, beginning	$ (28.5)	$ 7.6
Current period changes in fair value, net of tax	(11.4)	(16.7)
Reclassification to earnings, net of tax	5.9	(1.5)
Balance, ending	$ (34.0)	$ (10.6)