Investments (Tables)

6 Months Ended

Mar. 31, 2018

Investments [Abstract]

Investment

Our investments consist of (in millions):

	March 31, 2018		September 30, 2017
Certificates of deposit and time deposits	$	539.9	$	1,005.3
Commercial paper	4.5		20.3
Corporate debt securities	168.1		199.4
Government securities	78.5		116.8
Asset-backed securities	35.3		45.8
Total	$	826.3	$	1,387.6

Investments Classified by Contractual Maturity Date

The table below summarizes the contractual maturities of our investments as of March 31, 2018 (in millions). Actual maturities may differ from the contractual maturities below as borrowers may have the right to prepay certain obligations.

	Fair Value
Less than one year	$	613.4
Due in one to five years	212.9
Total	$	826.3

Fair Value, by Balance Sheet Grouping

Classification of our investments as current or noncurrent is based on the nature of the investment and when the investment is reasonably expected to be realized. These investments were included in the following line items within the Condensed Consolidated Balance Sheet (in millions):

	March 31, 2018		September 30, 2017
Short-term investments	$	613.4	$	1,124.6
Other assets	212.9		263.0
Total	$	826.3	$	1,387.6

Fair Value Measurements, Recurring and Nonrecurring

Fair values of our investments were (in millions):

	March 31, 2018
	Level 1		Level 2		Level 3		Total
Certificates of deposit and time deposits	$	—	$	539.9	$	—	$	539.9
Commercial paper	—		4.5		—		4.5
Corporate debt securities	—		168.1		—		168.1
Government securities	68.4		10.1		—		78.5
Asset-backed securities	—		35.3		—		35.3
Total	$	68.4	$	757.9	$	—	$	826.3

	September 30, 2017
	Level 1		Level 2		Level 3		Total
Certificates of deposit and time deposits	$	—	$	1,005.3	$	—	$	1,005.3
Commercial paper	—		20.3		—		20.3
Corporate debt securities	—		199.4		—		199.4
Government securities	98.9		17.9		—		116.8
Asset-backed securities	—		45.8		—		45.8
Total	$	98.9	$	1,288.7	$	—	$	1,387.6