Reclassifications from Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Changes in the balance of Accumulated Other Comprehensive Income
Balance at the beginning of the period	$ (245.2)	$ (335.7)
Other comprehensive income before reclassifications	(104.9)	62.7
Amounts reclassified from AOCI	21.9	27.8
Other comprehensive (loss) income, net of tax	(83.0)	90.5	$ 77.1
Balance at the end of the period	(328.2)	(245.2)	(335.7)
Cash flow hedging items
Changes in the balance of Accumulated Other Comprehensive Income
Balance at the beginning of the period	7.6	(41.5)
Other comprehensive income before reclassifications	(46.0)	36.0
Amounts reclassified from AOCI	9.9	13.1
Other comprehensive (loss) income, net of tax	(36.1)	49.1
Balance at the end of the period	(28.5)	7.6	(41.5)
Pension and other postretirement benefit plan items
Changes in the balance of Accumulated Other Comprehensive Income
Balance at the beginning of the period	(236.7)	(273.6)
Other comprehensive income before reclassifications	(32.0)	22.2
Amounts reclassified from AOCI	11.9	14.7
Other comprehensive (loss) income, net of tax	(20.1)	36.9
Balance at the end of the period	(256.8)	(236.7)	(273.6)
Unrealized losses on available-for-sale securities
Changes in the balance of Accumulated Other Comprehensive Income
Balance at the beginning of the period	(0.4)	(0.4)
Other comprehensive income before reclassifications	0.0	0.0
Amounts reclassified from AOCI	0.1	0.0
Other comprehensive (loss) income, net of tax	0.1	0.0
Balance at the end of the period	(0.3)	(0.4)	(0.4)
Foreign currency items
Changes in the balance of Accumulated Other Comprehensive Income
Balance at the beginning of the period	(15.7)	(20.2)
Other comprehensive income before reclassifications	(26.9)	4.5
Amounts reclassified from AOCI	0.0	0.0
Other comprehensive (loss) income, net of tax	(26.9)	4.5
Balance at the end of the period	$ (42.6)	$ (15.7)	$ (20.2)