Pension and Other Postretirement Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Pension and Other Postretirement Benefit Disclosures
Contributions	$ 1.5	$ 48.1
Pension Plans
Pension and Other Postretirement Benefit Disclosures
Service cost	8.0	8.1
Interest cost	14.3	13.3
Expected return on plan assets	(15.7)	(13.7)
Amortization of net loss	5.5	7.0
Amortization of prior service cost (benefit)	0.1	0.2
Net pension expense	12.2	14.9
Defined benefit pension plan, expected contributions during the remainder of fiscal year 2014	4.8
Other Postretirement Plans
Pension and Other Postretirement Benefit Disclosures
Service cost	1.0	1.1
Interest cost	3.1	3.0
Expected return on plan assets	(1.6)	(1.6)
Amortization of net loss	0.3	0.8
Amortization of prior service cost (benefit)		(1.0)
Net pension expense	$ 2.8	$ 2.3