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Other Income, Net (Other Income, Net) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Other Income and Expenses [Abstract] |  |  |  |
Interest income on corporate funds | $ (22.7) | $ (21.3) | $ (48.5) | $ (44.3)
Realized gains on available-for-sale securities | (0.2) | (2.0) | (0.5) | (2.5)
Realized losses on available-for-sale securities | 1.2 | 0.7 | 1.6 | 1.1
Gain on sale of assets | 0.0 | 0.0 | 0.4 | 0.0
Gain on Disposition of CHSA/COBRA | 0.0 | 205.4 | 0.0 | 205.4
Other income, net | $ (21.7) | $ (228.0) | $ (47.8) | $ (251.1)

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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 + Details
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- Definition Reflects the net positive or negative amount derived from subtracting from net proceeds of sale the carrying amounts, net of allocated reserves, of notes receivable transferred to a third party in a transaction that qualifies for sales treatment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64830801&loc=d3e107425-111719 + Details
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