Pension and Other Postretirement Benefits (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
Pension Plans
Pension and Other Postretirement Benefit Disclosures
Service cost	$ 32.1	$ 32.5	$ 23.0
Interest cost	57.5	53.0	51.3
Expected return on plan assets	(62.9)	(54.8)	(54.2)
Amortization of net loss	21.8	28.1	17.5
Amortization of prior service cost (benefit)	0.5	0.7	0.7
Net periodic benefit costs	49.0	59.5	38.3
Increase in capitalized periodic benefit costs	2.2
Other Postretirement Plans
Pension and Other Postretirement Benefit Disclosures
Service cost	4.0	4.4	3.7
Interest cost	12.5	12.2	11.8
Expected return on plan assets	(6.5)	(6.4)	(6.4)
Amortization of net loss	1.2	3.2	2.6
Amortization of prior service cost (benefit)	(0.1)	(4.1)	(7.9)
Net periodic benefit costs	$ 11.1	$ 9.3	$ 3.8