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Intangible Assets
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets
 
Intangible assets, which are included in Other assets, consist of the following:
(In millions)
 
At December 31,
 
 
2017
 
2016
 
 
Amortizing
 
Non-amortizing
 
Amortizing
 
Non-amortizing
Customer-related assets
 
$
18.6

 
$
—

 
$
20.9

 
$
—

Market-related assets
 
6.6

 
6.0

 
—

 
13.0

  Intangible assets, net
 
$
25.2

 
$
6.0

 
$
20.9

 
$
13.0



Effective January 1, 2017, the Company reclassified an approximate $7 million market-related asset from non-amortizing to amortizing. As of December 31, 2017, the weighted average remaining life for amortizing customer-related assets is 13 years. These amortizing intangible assets have no significant residual values.  Intangible assets are presented net of accumulated amortization totaling $14.6 million for customer-related assets and $4.3 million for market-related assets at December 31, 2017 and $12.0 million for customer-related assets and $4.5 million for market-related assets at December 31, 2016.  Annual amortization associated with intangible assets totaled $2.6 million in 2017, $2.5 million in 2016 and $3.1 million in 2015.  Amortization should approximate (in millions) $2.6 per year from 2018 through 2022. Intangible assets are primarily in the Nonutility Group.