Pension And Other Postretirement Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Required contributions made			$ 19.3
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5.8	5.7	16.9	17.1
Interest cost	12.8	11.6	37.5	34.8
Expected return on plan assets	(13.5)	(11.3)	(39.7)	(33.9)
Amortization of net loss	4.4	7.2	13.2	21.6
Amortization of prior service cost (benefit)	0.2	0.3	0.5	0.9
Net pension expense	9.7	13.5	28.4	40.5
Defined benefit pension plan, expected contributions	10.7		10.7
Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1.0	0.7	2.3	2.0
Interest cost	2.9	2.7	8.4	8.2
Expected return on plan assets	(1.6)	(1.3)	(4.8)	(3.9)
Amortization of net loss	0.6	1.5	1.9	4.4
Amortization of prior service cost (benefit)	(2.0)	(1.9)	(5.9)	(5.7)
Net pension expense	$ 0.9	$ 1.7	$ 1.9	$ 5.0