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Other Income, Net (Tables)
 6 Months Ended
Dec. 31, 2017
Other Income and Expenses [Abstract]  
Other Income, net
 
Three Months Ended
 
Six Months Ended
 
December 31,
 
December 31,
 
2017
 
2016
 
2017
 
2016
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
—

 
—

 
(0.4
)
 
—

Gain on sale of businesses (see Note 4)
—

 
(205.4
)
 
—

 
(205.4
)
Other income, net
$
(21.7
)
 
$
(228.0
)
 
$
(47.8
)
 
$
(251.1
)