XML 24 R5.htm IDEA: XBRL DOCUMENT v3.8.0.1
Consolidated Statement of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Comprehensive Income [Abstract]      
Net Income $ 172.2 $ 155.8 $ 141.5
Other Comprehensive Income (Loss) [Abstract]      
Unrealized Gain (Loss) on Securities - Net of Income Tax Expense (Benefit) of $0.7, $(0.2) and $(0.3) 0.9 (0.2) (0.5)
Unrealized Gain on Derivatives - Net of Income Tax Expense of $–, $– and $0.1 0.0 0.0 0.1
Defined Benefit Pension and Other Postretirement Benefit Plans - Net of Income Tax Expense (Benefit) of $2.2, $(2.4) and $(2.2) 4.7 (3.5) (3.0)
Total Other Comprehensive Income (Loss) 5.6 (3.7) (3.4)
Total Comprehensive Income 177.8 152.1 138.1
Less: Non-Controlling Interest in Subsidiaries 0.0 0.5 0.4
Total Comprehensive Income Attributable to ALLETE $ 177.8 $ 151.6 $ 137.7