Pension and Other Postretirement Benefits (Details 2) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Pension Plans
Amounts recognized in accumulated other comprehensive loss:
Net actuarial loss	$ 422.3	$ 341.2
Prior service cost (credit)	2.4	1.0
Total	424.7	342.2
Other changes in plan assets and benefit obligations recognized in other comprehensive loss consist of:
Net actuarial loss (gain)	97.8	(49.4)
Amortization of accumulated net actuarial loss	(16.7)	(21.8)
Prior service cost (credit)	1.6	(1.3)
Amortization of prior service (cost) benefit	(0.3)	(0.5)
Total, before tax effect	82.4	(73.0)
Additional information:
Accumulated benefit obligation for all pension plans	1,253.5	1,154.0
Other Postretirement Plans
Amounts recognized in accumulated other comprehensive loss:
Net actuarial loss	52.3	50.8
Prior service cost (credit)	(51.8)	0.0
Total	0.5	50.8
Other changes in plan assets and benefit obligations recognized in other comprehensive loss consist of:
Net actuarial loss (gain)	3.6	15.1
Amortization of accumulated net actuarial loss	(2.0)	(1.2)
Prior service cost (credit)	(51.9)	0.0
Amortization of prior service (cost) benefit	0.0	0.1
Total, before tax effect	$ (50.3)	$ 14.0