Pension and Other Postretirement Benefits (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Pension Plans
Pension and Other Postretirement Benefit Disclosures
Service cost	$ 32.5	$ 23.0	$ 22.8
Interest cost	53.0	51.3	46.5
Expected return on plan assets	(54.8)	(54.2)	(45.4)
Amortization of net loss	28.1	17.5	29.1
Amortization of prior service cost (benefit)	0.7	0.7	1.0
Plan settlement expense			0.1
Net pension expense	59.5	38.3	54.1
Other Postretirement Plans
Pension and Other Postretirement Benefit Disclosures
Service cost	4.4	3.7	2.7
Interest cost	12.2	11.8	10.9
Expected return on plan assets	(6.4)	(6.4)	(5.0)
Amortization of net loss	3.2	2.6	6.0
Amortization of prior service cost (benefit)	(4.1)	(7.9)	(7.9)
Net pension expense	$ 9.3	$ 3.8	$ 6.7