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Fair Value Measurements (Tables)
9 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of financial assets and liabilities at carrying value and fair value and the level within the fair value hierarchy
 
Carrying Value at
June 30, 2018
 
Fair Value at June 30, 2018
Using Inputs Considered as:
 
 
Level 1
 
Level 2
 
Level 3
Assets:
 

 
 

 
 

 
 

Cash and cash equivalents
$
71.1

 
$
71.1

 
$

 
$

Investments in rabbi trust
4.1

 
4.1

 

 

Derivative instruments
3.0

 

 
3.0

 

Indefinite-lived assets
4.0

 

 

 
4.0

 
 
 
 
 
 
 
 
Liabilities:
 

 
 

 
 

 
 

$150 senior unsecured notes
149.6

 
156.2

 

 

Revolving credit facility
175.6

 

 
175.6

 

  $100 Series A Notes
100.0

 

 
100.0

 

Derivative instruments
2.1

 

 
2.1