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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Schedule of financial instrument fair value
The estimated fair value of financial instruments at December 31, 2020 was as follows:
  Fair Value Measurements at Reporting Date Using
(In millions)Total
Carrying
Amount
Total
Estimated
Fair Value
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
Significant
Observable
Inputs
(Level 2)
Cash and cash equivalents$645.9 $645.9 $645.9 $— 
Derivative financial instruments:
Assets4.8 4.8 — 4.8 
Liabilities4.0 4.0 — 4.0 
Debt (a)1,629.1 1,847.7 1,594.2 253.5 
The estimated fair value of financial instruments at December 31, 2019 was as follows:
  Fair Value Measurements at Reporting Date Using
(In millions)Total
Carrying
Amount
Total
Estimated
Fair Value
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
Significant
Observable
Inputs
(Level 2)
Cash and cash equivalents$490.8 $490.8 $490.8 $— 
Derivative financial instruments:
Assets5.6 5.6 — 5.6 
Liabilities7.5 7.5 — 7.5 
Debt (a)1,411.2 1,676.5 1,552.8 123.7