Pension and Other Postretirement Benefits (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Pension Plans
Pension and Other Postretirement Benefit Disclosures
Service cost	$ 23.0	$ 22.8	$ 21.0
Interest cost	51.3	46.5	50.2
Expected return on plan assets	(54.2)	(45.4)	(45.0)
Amortization of net loss	17.5	29.1	27.0
Amortization of prior service cost (benefit)	0.7	1.0	1.1
Plan settlement expense		0.1
Net pension expense	38.3	54.1	54.3
Other Postretirement Plans
Pension and Other Postretirement Benefit Disclosures
Service cost	3.7	2.7	2.3
Interest cost	11.8	10.9	12.1
Expected return on plan assets	(6.4)	(5.0)	(4.6)
Amortization of net loss	2.6	6.0	5.0
Amortization of prior service cost (benefit)	(7.9)	(7.9)	(7.8)
Net pension expense	$ 3.8	$ 6.7	$ 7.0