Reclassifications from Accumulated Other Comprehensive Income (AOCI) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Changes in the balance of Accumulated Other Comprehensive Income
Balance at the beginning of the period	$ (335.7)
Other comprehensive (loss) income before reclassifications	2.2
Amounts reclassified from AOCI	8.4
Other comprehensive income, net of tax	10.6	28.6
Balance at the end of the period	(325.1)
Cash flow hedging items
Changes in the balance of Accumulated Other Comprehensive Income
Balance at the beginning of the period	(41.5)
Other comprehensive (loss) income before reclassifications	(1.2)
Amounts reclassified from AOCI	4.8
Other comprehensive income, net of tax	3.6
Balance at the end of the period	(37.9)
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)
Amounts reclassified from AOCI	3.6
Other comprehensive income, net of tax	3.6
Balance at the end of the period	(270.0)
Unrealized gains and losses on available-for-sale securities
Changes in the balance of Accumulated Other Comprehensive Income
Balance at the beginning of the period	(0.4)
Other comprehensive (loss) income before reclassifications	(0.1)
Other comprehensive income, net of tax	(0.1)
Balance at the end of the period	(0.5)
Foreign currency items
Changes in the balance of Accumulated Other Comprehensive Income
Balance at the beginning of the period	(20.2)
Other comprehensive (loss) income before reclassifications	3.5
Other comprehensive income, net of tax	3.5
Balance at the end of the period	$ (16.7)