REGULATORY ASSETS AND LIABILITIES

6 Months Ended

Jun. 30, 2019

Regulatory Assets and Liabilities Disclosure [Abstract]

REGULATORY ASSETS AND LIABILITIES

REGULATORY ASSETS AND LIABILITIES

The following regulatory assets and liabilities were reflected on our balance sheets at June 30, 2019 and December 31, 2018. For more information on our regulatory assets and liabilities, see Note 5, Regulatory Assets and Liabilities, in our 2018 Annual Report on Form 10-K.

(in millions)	June 30, 2019		December 31, 2018
Regulatory assets
Pension and OPEB costs	$	183.3	$	189.8
Environmental remediation costs	125.2		108.3
Plant retirements	76.6		78.1
Income tax related items	38.1		38.1
Asset retirement obligations	21.1		11.5
Termination of a tolling agreement with Fox Energy Company LLC	16.3		21.7
De Pere Energy Center	5.2		10.1
Other, net	19.8		28.3
Total regulatory assets	$	485.6	$	485.9
Balance sheet presentation
Other current assets	$	—	$	0.3
Regulatory assets	485.6		485.6
Total regulatory assets	$	485.6	$	485.9

(in millions)	June 30, 2019		December 31, 2018
Regulatory liabilities
Income tax related items	$	416.0	$	418.8
Removal costs	233.4		241.8
Pension and OPEB costs	71.7		72.6
Earnings sharing mechanism	21.3		21.2
Energy costs refundable through rate adjustments	16.7		14.3
Electric transmission costs	6.5		9.7
Other, net	2.7		14.5
Total regulatory liabilities	$	768.3	$	792.9
Balance sheet presentation
Other current liabilities	$	9.6	$	7.2
Regulatory liabilities	758.7		785.7
Total regulatory liabilities	$	768.3	$	792.9