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Fair Value - Recurring Fair Value Measures (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Investments [Abstract]    
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value $ 0.7  
Available-for-sale Securities, Debt Maturities, After One Year Through Three Years, Fair Value 2.7  
Available-for-sale Securities, Debt Maturities, After Three Years Through Five Years, Fair Value 1.7  
Available-for-sale Securities, Debt Maturities, After Five Years, Fair Value 0.5  
Recurring Fair Value Measures [Member]    
Investments [Abstract]    
Available-for-sale - Equity Securities [1] 7.6 $ 8.9
Available-for-sale – Corporate and Governmental Debt Securities (b) [1] 5.6 [2] 6.2
Cash Equivalents [1] 3.2 2.5
Total Fair Value of Assets 16.4 17.6
Liabilities [Abstract]    
Deferred Compensation 15.8 18.0 [3]
Total Fair Value of Liabilities 15.8 18.0
Recurring Fair Value Measures [Member] | Level 1 [Member]    
Investments [Abstract]    
Available-for-sale - Equity Securities [1] 7.6 8.9
Available-for-sale – Corporate and Governmental Debt Securities (b) [1] 0.0 [2] 0.0
Cash Equivalents [1] 3.2 2.5
Total Fair Value of Assets 10.8 11.4
Liabilities [Abstract]    
Deferred Compensation 0.0 0.0 [3]
Total Fair Value of Liabilities 0.0 0.0
Recurring Fair Value Measures [Member] | Level 2 [Member]    
Investments [Abstract]    
Available-for-sale - Equity Securities [1] 0.0 0.0
Available-for-sale – Corporate and Governmental Debt Securities (b) [1] 5.6 [2] 6.2
Cash Equivalents [1] 0.0 0.0
Total Fair Value of Assets 5.6 6.2
Liabilities [Abstract]    
Deferred Compensation 15.8 18.0 [3]
Total Fair Value of Liabilities 15.8 18.0
Recurring Fair Value Measures [Member] | Level 3 [Member]    
Investments [Abstract]    
Available-for-sale - Equity Securities [1] 0.0 0.0
Available-for-sale – Corporate and Governmental Debt Securities (b) [1] 0.0 [2] 0.0
Cash Equivalents [1] 0.0 0.0
Total Fair Value of Assets 0.0 0.0
Liabilities [Abstract]    
Deferred Compensation 0.0 0.0 [3]
Total Fair Value of Liabilities $ 0.0 $ 0.0
[1] Included in Other Non-Current Assets on the Consolidated Balance Sheet.
[2] As of June 30, 2022, the aggregate amount of available-for-sale corporate and governmental debt securities maturing in one year or less was $0.7 million, in one year to less than three years was $2.7 million, in three years to less than five years was $1.7 million and in five or more years was $0.5 million.
[3] Included in Other Non-Current Liabilities on the Consolidated Balance Sheet.