Pension and Other Postretirement Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Pension Plans
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$ 1,218.1	$ 929.2
Plan liabilities assumed in connection with Latrobe acquisition		116.3
Service cost	32.5	23.0	22.8
Interest cost	53.0	51.3	46.5
Benefits paid	(70.6)	(61.1)
Actuarial (gain) loss	(45.7)	159.5
Plan settlements	(0.6)
Other		(0.1)
Projected benefit obligation at end of year	1,186.7	1,218.1	929.2
Change in plan assets:
Fair value of plan assets at beginning of year	770.9	710.2
Plan assets acquired in connection with Latrobe acquisition		72.8
Actual return on plan assets	82.3	15.8
Benefits paid from plan assets	(70.6)	(61.1)
Contributions	148.2	33.2
Plan settlements	(0.6)
Fair value of plan assets at end of year	930.2	770.9	710.2
Funded status of the plans
Funded status of the plans	(256.5)	(447.2)
Other Postretirement Plans
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	282.2	204.2
Plan liabilities assumed in connection with Latrobe acquisition		57.2
Service cost	4.4	3.7	2.7
Interest cost	12.2	11.8	10.9
Benefits paid	(13.6)	(11.7)
Actuarial (gain) loss	(25.9)	16.3
Other	0.2	0.4
Projected benefit obligation at end of year	259.8	282.2	204.2
Change in plan assets:
Fair value of plan assets at beginning of year	85.3	80.3
Actual return on plan assets	8.2	5.3
Benefits paid from plan assets	(13.6)	(11.7)
Contributions	13.3	11.4
Fair value of plan assets at end of year	93.2	85.3	80.3
Funded status of the plans
Funded status of the plans	$ (166.6)	$ (196.9)