Reclassifications from Accumulated Other Comprehensive Income (AOCI) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
Changes in the balance of Accumulated Other Comprehensive Income
Balance at the beginning of the period	$ (335.7)	$ (412.5)
Other comprehensive income before reclassifications	62.7
Amounts reclassified from AOCI	27.8
Other comprehensive income (loss), net of tax	90.5	77.1	(180.6)
Balance at the end of the period	(245.2)	(335.7)	(412.5)
Cash flow hedging items
Changes in the balance of Accumulated Other Comprehensive Income
Balance at the beginning of the period	(41.5)
Other comprehensive income before reclassifications	36.0
Amounts reclassified from AOCI	13.1
Other comprehensive income (loss), net of tax	49.1
Balance at the end of the period	7.6
Pension and other postretirement benefit plan items
Changes in the balance of Accumulated Other Comprehensive Income
Balance at the beginning of the period	(273.6)
Other comprehensive income before reclassifications	22.2
Amounts reclassified from AOCI	14.7
Other comprehensive income (loss), net of tax	36.9
Balance at the end of the period	(236.7)
Unrealized losses on available-for-sale securities
Changes in the balance of Accumulated Other Comprehensive Income
Balance at the end of the period	(0.4)	(0.4)
Foreign currency items
Changes in the balance of Accumulated Other Comprehensive Income
Balance at the beginning of the period	(20.2)
Other comprehensive income before reclassifications	4.5
Other comprehensive income (loss), net of tax	4.5
Balance at the end of the period	$ (15.7)