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Fair Value Measurement (Tables)
 3 Months Ended
Mar. 31, 2019
Fair Value Disclosures [Abstract]  
Schedule of Carrying Amount and Estimated Fair Values
The following presents the carrying amounts and estimated fair values of financial instruments not measured at fair value in the Condensed Consolidated Balance Sheets at March 31, 2019 and December 31, 2018: 
 
March 31, 2019 (unaudited)
 
December 31, 2018
(millions)
Carrying
Amount
 
Fair Value
 
Carrying
Amount
 
Fair Value
Credit Facility, net of original discount on borrowings and deferred financing costs
$
368.7

 
$
368.7

 
$
371.2

 
$
371.2

Other obligations
$
15.3

 
$
15.3

 
$
15.4

 
$
15.4