Pension and Other Postretirement Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Pension Plans
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$ 929.2	$ 957.2
Plan liabilities assumed in connection with Latrobe acquisition	116.3
Service cost	23.0	22.8	21.0
Interest cost	51.3	46.5	50.2
Benefits paid	(61.1)	(55.8)
Actuarial loss (gain)	159.5	(41.5)
Plan settlements		(0.3)
Plan amendments		0.2
Other	(0.1)	0.1
Projected benefit obligation at end of year	1,218.1	929.2	957.2
Change in plan assets:
Fair value of plan assets at beginning of year	710.2	631.5
Plan assets acquired in connection with Latrobe acquisition	72.8
Actual return on plan assets	15.8	127.8
Benefits paid from plan assets	(61.1)	(55.8)
Contributions	33.2	7.0
Plan settlements		(0.3)
Fair value of plan assets at end of year	770.9	710.2	631.5
Funded status of the plans
Funded status of the plans	(447.2)	(219.0)
Other Postretirement Plans
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	204.2	224.6
Plan liabilities assumed in connection with Latrobe acquisition	57.2
Service cost	3.7	2.7	2.3
Interest cost	11.8	10.9	12.1
Benefits paid	(11.7)	(10.7)
Actuarial loss (gain)	16.3	(23.6)
Plan participant contributions	0.3
Other	0.4	0.3
Projected benefit obligation at end of year	282.2	204.2	224.6
Change in plan assets:
Fair value of plan assets at beginning of year	80.3	63.2
Actual return on plan assets	5.3	17.4
Benefits paid from plan assets	(11.7)	(10.7)
Contributions	11.4	10.4
Fair value of plan assets at end of year	85.3	80.3	63.2
Funded status of the plans
Funded status of the plans	$ (196.9)	$ (123.9)