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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping
The carrying values and estimated fair values using primarily Level 2 assumptions of the Company's other financial instruments follow:

 
 
At December 31,
 
 
2017
 
2016
(In millions)
 
Carrying
Amount
 
Est. Fair
Value
 
Carrying
Amount
 
Est. Fair
Value
Long-term debt
 
$
1,838.7

 
$
1,981.2

 
$
1,714.0

 
$
1,835.8

Short-term borrowings & notes payable
 
249.5

 
249.5

 
194.4

 
194.4

Cash & cash equivalents
 
16.6

 
16.6

 
68.6

 
68.6

Natural gas purchase instrument assets (1)
 
0.5

 
0.5

 
—

 
—

Natural gas purchase instrument liabilities (2)
 
4.5

 
4.5

 
—

 
—

Interest rate swap liabilities (3)
 
1.4

 
1.4

 
—

 
—

Restricted cash
 
—

 
—

 
0.9

 
0.9


(1) Presented in "Other utility & corporate investments" on the Consolidated Balance Sheets.
(2) Presented in "Deferred credits & other liabilities" on the Consolidated Balance Sheets.
(3) Presented in "Deferred credits & other liabilities" on the Consolidated Balance Sheets.