Summary of Significant Accounting Policies (Tables)

9 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Schedule of Inter-Company Transactions

In addition, Spire Missouri’s other transactions with affiliates included

	Three Months Ended June 30,				Nine Months Ended June 30,
	2019		2018		2019		2018
Purchases of natural gas from Spire Marketing	$	12.3	$	10.4	$	81.3	$	52.0
Sales of natural gas to Spire Marketing		0.2		—		1.6		0.3
Transportation services received from Spire NGL Inc.		0.3		0.3		0.8		0.8

Schedule of capital expenditures excluded from statement of cash flow

Accrued capital expenditures, shown in the following table, are excluded from capital expenditures in the statements of cash flows until paid.

	June 30,		September 30,		June 30,
	2019		2018		2018
Spire	$	60.2	$	62.1	$	33.8
Spire Missouri		26.3		36.7		21.9
Spire Alabama		9.0		8.9		9.9