Reclassifications from Accumulated Other Comprehensive (Loss) Income - Schedule of Changes in AOCI by Component, Net of Tax (Details) - USD ($) $ in Millions	12 Months Ended
Jun. 30, 2016	Jun. 30, 2015
Changes in the balance of Accumulated Other Comprehensive Income
Balances, beginning of period	$ 1,325.9	$ 1,504.3
Balances, end of period	1,104.9	1,325.9
Cash flow hedging items
Changes in the balance of Accumulated Other Comprehensive Income
Balances, beginning of period	(28.5)	7.6
Other comprehensive loss before reclassifications	(20.8)	(46.0)
Amounts reclassified from AOCI	27.5	9.9
Other comprehensive (loss) income, net of tax	6.7	(36.1)
Balances, end of period	(21.8)	(28.5)
Pension and other postretirement benefit plan items
Changes in the balance of Accumulated Other Comprehensive Income
Balances, beginning of period	(256.8)	(236.7)
Other comprehensive loss before reclassifications	(102.5)	(32.0)
Amounts reclassified from AOCI	15.0	11.9
Other comprehensive (loss) income, net of tax	(87.5)	(20.1)
Balances, end of period	(344.3)	(256.8)
Unrealized losses on available-for-sale securities
Changes in the balance of Accumulated Other Comprehensive Income
Balances, beginning of period	(0.3)	(0.4)
Other comprehensive loss before reclassifications	0.0	0.0
Amounts reclassified from AOCI	0.0	0.1
Other comprehensive (loss) income, net of tax	0.0	0.1
Balances, end of period	(0.3)	(0.3)
Foreign currency items
Changes in the balance of Accumulated Other Comprehensive Income
Balances, beginning of period	(42.6)	(15.7)
Other comprehensive loss before reclassifications	(0.9)	(26.9)
Amounts reclassified from AOCI	0.0	0.0
Other comprehensive (loss) income, net of tax	(0.9)	(26.9)
Balances, end of period	(43.5)	(42.6)
Accumulated Other Comprehensive (Loss) Income
Changes in the balance of Accumulated Other Comprehensive Income
Balances, beginning of period	(328.2)	(245.2)
Other comprehensive loss before reclassifications	(124.2)	(104.9)
Amounts reclassified from AOCI	42.5	21.9
Other comprehensive (loss) income, net of tax	(81.7)	(83.0)
Balances, end of period	$ (409.9)	$ (328.2)

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Section 45
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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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