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Fair Value Information (Tables)
3 Months Ended
Mar. 31, 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):
March 31, 2020December 31, 2019
Fair Value
Hierarchy
Level
Carrying
Amount
Estimated
Fair
Value
Carrying
Amount
Estimated
Fair
Value
Assets
Cash and cash equivalents1$187.7  $187.7  $205.3  $205.3  
Liabilities
Senior Unsecured Notes1248.2  245.7  248.1  254.5