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Fair Value (Notes)
9 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
Fair Value Fair Value Measurements
Fair value is the exchange price that would be received for an asset or paid to transfer a liability in an orderly transaction between market participants. In arriving at a fair value measurement, the Company uses a fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last unobservable. The three levels of inputs used to establish fair value are the following:
Level 1 — Quoted prices in active markets for identical assets or liabilities;
Level 2 — Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and
Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The Company elected not to use the fair value option for cash and cash equivalents and debt.

For the financial assets and liabilities that the Company does not reflect at fair value, the following tables present both their respective carrying value and fair value at June 30, 2020 and September 30, 2019.
Fair Value at June 30, 2020
 Carrying ValueLevel 1Level 2Level 3Total
 (in millions)
Cash and cash equivalents (a)
$355.6  $355.6  $—  $—  $355.6  
Debt (b)
640.6  —  660.4  —  660.4  

Fair Value at September 30, 2019
Carrying ValueLevel 1Level 2 Level 3Total
(in millions)
Cash and cash equivalents (a)
$382.8  $382.8  $—  $—  $382.8  
Debt (b)
460.5  —  497.3  —  497.3  
 _____________________
(a) The fair values of cash and cash equivalents approximate their carrying values due to their short-term nature and are classified as Level 1 within the fair value hierarchy.
(b) At June 30, 2020 and September 30, 2019, debt consisted of the Company's senior notes. The fair value of the senior notes is determined based on quoted prices, which is classified as Level 2 within the fair value hierarchy.

Non-financial assets measured at fair value on a non-recurring basis primarily include real estate assets which the Company reviews for indicators of potential impairment and performs impairment evaluations when necessary.
Fair Value Measurements, Not Measured at Fair Value
For the financial assets and liabilities that the Company does not reflect at fair value, the following tables present both their respective carrying value and fair value at June 30, 2020 and September 30, 2019.
Fair Value at June 30, 2020
 Carrying ValueLevel 1Level 2Level 3Total
 (in millions)
Cash and cash equivalents (a)
$355.6  $355.6  $—  $—  $355.6  
Debt (b)
640.6  —  660.4  —  660.4  

Fair Value at September 30, 2019
Carrying ValueLevel 1Level 2 Level 3Total
(in millions)
Cash and cash equivalents (a)
$382.8  $382.8  $—  $—  $382.8  
Debt (b)
460.5  —  497.3  —  497.3  
 _____________________
(a) The fair values of cash and cash equivalents approximate their carrying values due to their short-term nature and are classified as Level 1 within the fair value hierarchy.
(b) At June 30, 2020 and September 30, 2019, debt consisted of the Company's senior notes. The fair value of the senior notes is determined based on quoted prices, which is classified as Level 2 within the fair value hierarchy.