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Fair Value Measurements (Tables)
6 Months Ended
Mar. 31, 2021
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 March 31, 2021
Fair Value at March 31, 2021
Using Inputs Considered as:
 Level 1Level 2Level 3
Assets:    
Cash and cash equivalents$344.9 $344.9 $— $— 
Investments in rabbi trust3.8 3.8 — — 
Derivative instruments3.3 — 3.3 — 
Liabilities:    
2020 Notes400.0 429.4 — — 
2019 Notes374.5 412.5 — — 
2021 Notes350.0 341.6 — — 
Series A Notes100.0 — 106.7 — 
Derivative instruments1.9 — 1.9 — 
 
 
Carrying Value at September 30, 2020
Fair Value at September 30, 2020
Using Inputs Considered as:
 Level 1Level 2Level 3
Assets:    
Cash and cash equivalents$302.2 $302.2 $— $— 
Investments in rabbi trust3.9 3.9 — — 
Derivative instruments2.6 — 2.6 — 
Liabilities:    
$500.0 term loan475.0 — 475.0 — 
2020 Notes400.0 429.0 — — 
2019 Notes374.5 409.0 — — 
$225.0 term loan213.7 — 213.7 — 
Series A Notes100.0 — 105.3 — 
Derivative instruments1.6 — 1.6 —