Pension and Other Postretirement Benefits (Details 4) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Pension Plans
Pension and Other Postretirement Benefit Disclosures
Service cost	$ 32.2	$ 32.1	$ 32.5
Interest cost	54.1	57.5	53.0
Expected return on plan assets	(68.8)	(62.9)	(54.8)
Amortization of net loss	16.7	21.8	28.1
Amortization of prior service cost (benefit)	0.3	0.5	0.7
Curtailment	0.0	0.0	0.0
Net periodic benefit costs	34.5	49.0	59.5
Increase in capitalized periodic benefit costs	2.2
Other Postretirement Plans
Pension and Other Postretirement Benefit Disclosures
Service cost	4.4	4.0	4.4
Interest cost	11.8	12.5	12.2
Expected return on plan assets	(6.6)	(6.5)	(6.4)
Amortization of net loss	2.0	1.2	3.2
Amortization of prior service cost (benefit)	0.0	(0.1)	(4.1)
Curtailment	(1.6)	0.0	0.0
Net periodic benefit costs	$ 10.0	$ 11.1	$ 9.3