EARNINGS PER COMMON SHARE

6 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

EARNINGS PER COMMON SHARE

EARNINGS PER COMMON SHARE

Spire	Three Months Ended March 31,				Six Months Ended March 31,
	2018		2017		2018		2017
Basic Earnings Per Share:
Net Income	$	98.2	$	108.0	$	214.2	$	153.2
Less: Income allocated to participating securities	0.2		0.2		0.5		0.4
Net Income Available to Common Shareholders	$	98.0	$	107.8	$	213.7	$	152.8
Weighted Average Shares Outstanding (in millions)	48.2		45.6		48.2		45.6
Basic Earnings Per Share of Common Stock	$	2.03	$	2.36	$	4.43	$	3.35
Diluted Earnings Per Share:
Net Income	$	98.2	$	108.0	$	214.2	$	153.2
Less: Income allocated to participating securities	0.2		0.2		0.5		0.4
Net Income Available to Common Shareholders	$	98.0	$	107.8	$	213.7	$	152.8
Weighted Average Shares Outstanding (in millions)	48.2		45.6		48.2		45.6
Dilutive Effect of Restricted Stock and Restricted Stock Units (in millions)*	0.2		0.1		0.2		0.1
Weighted Average Diluted Shares (in millions)	48.4		45.7		48.4		45.7
Diluted Earnings Per Share of Common Stock	$	2.03	$	2.36	$	4.42	$	3.34
* Calculation excludes certain outstanding shares (shown in millions by period at the right) attributable to stock units subject to performance or market conditions and restricted stock, which could have a dilutive effect in the future	0.4		0.5		0.4		0.5