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Fair Value Information (Tables)
9 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Schedule of fair value of financial instruments The following table includes the fair value of our financial instruments for which disclosure of fair value is required (in millions):
September 30, 2020December 31, 2019
Fair Value
Hierarchy
Level
Carrying
Amount
Estimated
Fair
Value
Carrying
Amount
Estimated
Fair
Value
Assets
Cash and cash equivalents1$180.0 $180.0 $205.3 $205.3 
Liabilities
Senior Unsecured Notes1248.5 250.0 248.1 254.5