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Derivatives (Tables)
 9 Months Ended
Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Summary of Derivative Assets and Liabilities
Derivative assets and liabilities at June 30, 2017 and September 30, 2016 consisted of the following:
 
Recorded to
 
June 30, 2017
 
September 30, 2016
Long-term derivative asset
Other non-current assets
 
$
0.1

 
$
—

Short-term derivative liability
Accrued expenses and other liabilities
 
$
1.5

 
$
—

Long-term derivative liability
Other non-current liabilities
 
$
0.4

 
$
—

Other Comprehensive Income/Loss
Accumulated other comprehensive loss
 
$
0.4

 
$
—
Summary of Gains and Losses (Net of Reclassifications Into Income)
Gains and losses (net of reclassifications into income, including any ineffective portion) related to the interest rate swaps of the Company and the Predecessor were as follows:
 
 
 
Successor
 
 
Predecessor
 
Recorded to
 
Three Months Ended 
 June 30, 2017
 
Nine Months Ended June 30, 2017
 
 
April 1 Through June 8, 2016
 
October 1, 2015 Through June 8, 2016
Realized loss
Interest expense
 
$
1.2

 
$
1.5

 
 
$
0.1

 
$
0.3

Unrealized gain (loss), net of tax
Other comprehensive income(loss)
 
$
(0.7
)
 
$
(0.4
)
 
 
$
0.1

 
$
0.3