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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2019
Fair Value Disclosures [Abstract]  
Assets and Liabilities Measured at Fair Value on a Recurring Basis

Other Fair Value Measurements The following table presents the fair value for our senior unsecured notes in Long-term debt (in millions):
 
As of December 31,
 
2019
 
2018
Quoted Prices in Active Markets for Similar Instruments (Level 2):
 
 
 
Senior unsecured notes
$
356.8

 
$
338.4