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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2016
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of changes to asset retirement obligations | The following table shows changes to our AROs during the years ended December 31:
(in millions) |  | 2016 |  | 2015 |  | 2014
Balance as of January 1 |  | $ | 571.2 |  |  | $ | 43.6 |  |  | $ | 42.3 |
Integrys subsidiaries |  | — |  |  | 491.0 |  |  | — |
Accretion |  | 28.3 |  |  | 14.5 |  |  | 2.4 |
Additions and revisions to estimated cash flows |  | — |  |  | 35.5 |  | * | — |
Liabilities settled |  | (41.8 | ) |  | (13.4 | ) |  | (1.1 | )
Balance as of December 31 |  | $ | 557.7 |  |  | $ | 571.2 |  |  | $ | 43.6 |
* | During 2015, an ARO of $16.1 million was recorded for fly-ash landfills located at generation facilities owned by WE and WPS. An ARO of $9.0 million was also recorded during 2015 for the Hazardous and Solid Waste Management System; Disposal of Coal Combustion Residuals from Electric Utilities rule passed by the EPA in April 2015. In addition, AROs increased $10.4 million in 2015 due to revisions made to estimated cash flows primarily for changes in the weighted average cost to retire natural gas distribution pipe at PGL and NSG.

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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