Pension and Other Postretirement Benefits (Details 7) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2012
Pension and Other Postretirement Benefit Disclosures
Estimated net pension expense	$ 68.3
Amounts in other comprehensive loss that are expected to recognized as components of net periodic benefit cost in the next fiscal year
Amortization of prior service cost (credit)	(3.4)
Amortization of net actuarial loss	31.3
Amortization of accumulated other comprehensive loss	27.9
Pension Plans
Pension and Other Postretirement Benefit Disclosures
Estimated net pension expense	59.0
Discount rate used to calculate the net periodic benefit costs for June 30, 2013 (as a percent)	4.50%
Expected long-term rate of return on plan assets used to calculate the net periodic benefit costs (as a percent)	7.00%
Amounts in other comprehensive loss that are expected to recognized as components of net periodic benefit cost in the next fiscal year
Amortization of prior service cost (credit)	0.7
Amortization of net actuarial loss	28.1
Amortization of accumulated other comprehensive loss	28.8
Other Postretirement Plans
Pension and Other Postretirement Benefit Disclosures
Estimated net pension expense	9.3
Discount rate used to calculate the net periodic benefit costs for June 30, 2013 (as a percent)	4.50%
Expected long-term rate of return on plan assets used to calculate the net periodic benefit costs (as a percent)	7.50%
Amounts in other comprehensive loss that are expected to recognized as components of net periodic benefit cost in the next fiscal year
Amortization of prior service cost (credit)	(4.1)
Amortization of net actuarial loss	3.2
Amortization of accumulated other comprehensive loss	$ (0.9)