Allowance for Doubtful Accounts (Tables)

12 Months Ended

Dec. 31, 2016

Allowance for Doubtful Accounts

The following table shows the balances and activity in the Company’s Allowance for Doubtful Accounts for 2014—2016 (millions):

ALLOWANCE FOR DOUBTFUL ACCOUNTS

	Balance at Beginning of Period		Provision		Recoveries		Accounts Written Off		Balance at End of Period
Year Ended December 31, 2016
Electric	$	0.6	$	2.9	$	0.3	$	3.0	$	0.8
Gas		0.5		1.7		0.3		2.3		0.2
Other		0.1		—		—		—		0.1
	$	1.2	$	4.6	$	0.6	$	5.3	$	1.1
Year Ended December 31, 2015
Electric	$	1.3	$	2.5	$	0.3	$	3.5	$	0.6
Gas		0.4		2.8		0.4		3.1		0.5
Other		0.1		—		—		—		0.1
	$	1.8	$	5.3	$	0.7	$	6.6	$	1.2
Year Ended December 31, 2014
Electric	$	1.3	$	2.9	$	0.3	$	3.2	$	1.3
Gas		0.2		3.1		0.3		3.2		0.4
Other		0.1		—		—		—		0.1
	$	1.6	$	6.0	$	0.6	$	6.4	$	1.8