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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Net Income $ 98.2 $ 108.0 $ 214.2 $ 153.2
Cash flow hedging derivative instruments:        
Net hedging gains arising during the period 1.8 1.0 1.9 12.5
Reclassification adjustment for (gains) losses included in net income (0.4) (0.1) (0.8) 0.1
Net unrealized gains on cash flow hedging derivative instruments 1.4 0.9 1.1 12.6
Net gains on defined benefit pension and other postretirement plans 0.0 0.0 0.1 0.1
Net unrealized losses on available for sale securities 0.0 0.0 (0.1) (0.1)
Other Comprehensive Income, Before Tax 1.4 0.9 1.1 12.6
Income Tax Expense Related to Items of Other Comprehensive Income 0.3 0.4 0.2 4.7
Other Comprehensive Income, Net of Tax 1.1 0.5 0.9 7.9
Comprehensive Income 99.3 108.5 215.1 161.1
Spire Missouri        
Net Income 38.4 57.0 127.8 95.0
Cash flow hedging derivative instruments:        
Other Comprehensive Income, Net of Tax (0.1) (0.2) (0.1) 0.0
Comprehensive Income $ 38.3 $ 56.8 $ 127.7 $ 95.0