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Regulatory Matters (Tables)

9 Months Ended

Sep. 30, 2017

Regulated Operations [Abstract]

Regulatory Assets and Liabilities [Table Text Block]

Regulatory Assets and Liabilities	September 30, 2017				December 31, 2016
Millions
Current Regulatory Assets
Deferred Fuel Adjustment Clause		$20.2				$18.6
Total Current Regulatory Assets	20.2				18.6
Non-Current Regulatory Assets
Defined Benefit Pension and Other Postretirement Benefit Plans	221.4				226.1
Income Taxes (a)	35.7				33.8
Asset Retirement Obligations	29.8				26.0
Cost Recovery Riders	5.2				30.5
PPACA Income Tax Deferral	5.0				5.0
Conservation Improvement Program	4.9				4.0
Other	8.6				4.7
Total Non-Current Regulatory Assets	310.6				330.1
Total Regulatory Assets		$330.8				$348.7
Non-Current Regulatory Liabilities
Wholesale and Retail Contra AFUDC		$57.0				$56.8
Plant Removal Obligations	19.2				19.1
Income Taxes	18.6				19.1
North Dakota Investment Tax Credits	13.9				28.2
Other	2.8				2.6
Total Non-Current Regulatory Liabilities		$111.5				$125.8

(a) See Note 1. Operations and Significant Accounting Policies – Revision of Prior Balance Sheet.

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- Definition

The entire disclosure for detailed information about regulatory assets and liabilities, including current and noncurrent assets created when regulatory agencies permit the deferral of costs to the balance sheet that would otherwise be required to appear on the company's income statement and would be charged against current expenses or revenues, as well as current and noncurrent liabilities created when regulatory agencies permit.

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