Statements of Consolidated Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income	$ 91.7	$ 45.4	$ 91.7
Other comprehensive income (loss), net of tax – Note 10:
Defined benefit pension plan and Salaried VEBA	2.9	(1.4)	(5.8)
Available for sale securities	(0.6)	0.5	0.9
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(13.9)	0.7	0.0
Foreign currency translation	(0.1)	0.2	(0.1)
Other comprehensive loss, net of tax	(11.7)	0.0	(5.0)
Comprehensive income	$ 80.0	$ 45.4	$ 86.7