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Fair Value (Tables)
12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Recurring Fair Value Measures [Table Text Block]
 Fair Value as of December 31, 2021
Recurring Fair Value MeasuresLevel 1Level 2Level 3Total
Millions    
Assets:    
Investments (a)
Available-for-sale – Equity Securities$8.9$8.9
Available-for-sale – Corporate and Governmental Debt Securities (b)
$6.26.2
Cash Equivalents2.52.5
Total Fair Value of Assets$11.4$6.2$17.6
Liabilities:     
Deferred Compensation (c)
$18.0$18.0
Total Fair Value of Liabilities$18.0$18.0
Total Net Fair Value of Assets (Liabilities)$11.4$(11.8)$(0.4)
(a)Included in Other Non-Current Assets on the Consolidated Balance Sheet.
(b)As of December 31, 2021, the aggregate amount of available-for-sale corporate and governmental debt securities maturing in one year or less was $1.0 million, in one year to less than three years was $2.3 million, in three years to less than five years was $2.1 million and in five or more years was $0.8 million.
(c)Included in Other Non-Current Liabilities on the Consolidated Balance Sheet.

 Fair Value as of December 31, 2020
Recurring Fair Value MeasuresLevel 1Level 2Level 3Total
Millions    
Assets:    
Investments (a)
Available-for-sale – Equity Securities$7.2$7.2
Available-for-sale – Corporate and Governmental Debt Securities$10.410.4
Cash Equivalents5.55.5
Total Fair Value of Assets$12.7$10.4$23.1
Liabilities: (b)
    
Deferred Compensation$21.0$21.0
Total Fair Value of Liabilities$21.0$21.0
Total Net Fair Value of Assets (Liabilities)$12.7$(10.6)$2.1
(a)Included in Other Non-Current Assets on the Consolidated Balance Sheet.
(b)Included in Other Non-Current Liabilities on the Consolidated Balance Sheet.
Financial Instruments [Table Text Block]
Financial InstrumentsCarrying AmountFair Value
Millions  
Short-Term and Long-Term Debt (a)
  
December 31, 2021$1,986.4$2,192.6
December 31, 2020$1,806.4$2,122.0
(a) Excludes unamortized debt issuance costs.