Investments (Tables)

12 Months Ended

Sep. 30, 2019

Investments, Debt and Equity Securities [Abstract]

Schedule of Investments

Our investments consist of (in millions):

	September 30,
	2019			2018
Fixed income securities	$	43.9		$	419.0
Equity securities	721.5			1,090.0
Other	68.1			69.9
Total investments	833.5			1,578.9
Less short-term investments	(39.6		)	(290.9		)
Long-term investments	$	793.9		$	1,288.0

Schedule of Available-for-sale Investments

Our available-for-sale investments consist of (in millions):

	September 30,
	2019		2018
Certificates of deposit and time deposits	$	0.6	$	169.6
Corporate debt securities	31.8		158.4
Government securities	6.3		65.8
Asset-backed securities	5.2		25.2
Total	$	43.9	$	419.0

These investments were included in the following line items within the Consolidated Balance Sheet (in millions):

	September 30,
	2019		2018
Short-term investments	$	39.6	$	290.9
Long-term investments	4.3		128.1
Total	$	43.9	$	419.0

Schedule of Contractual Maturities of Investments

The table below summarizes the contractual maturities of our investments as of September 30, 2019 (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	$	39.6
Due in one to five years	4.3
Total	$	43.9

Schedule of Fair Value of Investments

Fair values of our investments were (in millions):

	September 30, 2019
	Level 1		Level 2		Level 3		Total
Certificates of deposit and time deposits	$	—	$	0.6	$	—	$	0.6
Corporate debt securities	—		31.8		—		31.8
Government securities	6.3		—		—		6.3
Asset-backed securities	—		5.2		—		5.2
Equity securities	721.5		—		—		721.5
Total	$	727.8	$	37.6	$	—	$	765.4

	September 30, 2018
	Level 1		Level 2		Level 3		Total
Certificates of deposit and time deposits	$	—	$	169.6	$	—	$	169.6
Corporate debt securities	—		158.4		—		158.4
Government securities	55.7		10.1		—		65.8
Asset-backed securities	—		25.2		—		25.2
Equity securities	—		—		1,090.0		1,090.0
Total	$	55.7	$	363.3	$	1,090.0	$	1,509.0

Summary of Changes in the Fair Value of Level 3 Investments

The table below sets forth a summary of changes in the fair value of our Level 3 investments (in millions):

	Fair Value
Balance September 30, 2018	$	1,090.0
Unrealized loss	(149.0		)
Transfer to Level 1 upon registration of PTC Shares on November 28, 2018	(941.0		)
Balance September 30, 2019	$	—