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Marketable Securities (Tables)
 3 Months Ended
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Reconciles Cost Basis to Fair Market Value of Company's Equity Security
The following reconciles the cost basis to the fair market value of the Company’s equity securities that are classified as available-for-sale: 
Period Ended:
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Other Than Temporary Impairment
 
Fair Value
December 31, 2016
$
0.7

 
$
4.0

 
$
(0.3
)
 
$
—

 
$
4.4

September 24, 2016
$
2.4

 
$
—

 
$
(0.3
)
 
$
(1.1
)
 
$
1.0