Pension and Other Postretirement Benefits - Schedule of Amounts in Other Comprehensive Loss that are Expected to be Recognized as Components of Net Periodic Benefit Cost (Details) $ in Millions	12 Months Ended
	Jun. 30, 2016 USD ($)
Amounts in other comprehensive loss that are expected to recognized as components of net periodic benefit cost in the next fiscal year
Amortization of prior service cost (benefit)	$ (6.1)
Amortization of net actuarial loss	40.6
Amortization of accumulated other comprehensive loss (gain)	34.5
Pension Plans
Amounts in other comprehensive loss that are expected to recognized as components of net periodic benefit cost in the next fiscal year
Amortization of prior service cost (benefit)	0.4
Amortization of net actuarial loss	37.4
Amortization of accumulated other comprehensive loss (gain)	37.8
Other Postretirement Plans
Amounts in other comprehensive loss that are expected to recognized as components of net periodic benefit cost in the next fiscal year
Amortization of prior service cost (benefit)	(6.5)
Amortization of net actuarial loss	3.2
Amortization of accumulated other comprehensive loss (gain)	$ (3.3)