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Fair Value - Recurring Fair Value Measures (Details) - USD ($)
$ in Millions
Sep. 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 2.6  
Available-for-sale Securities, Debt Maturities, After Three Years Through Five Years, Fair Value 1.4  
Available-for-sale Securities, Debt Maturities, After Five Years, Fair Value 0.6  
Recurring Fair Value Measures [Member]    
Investments [Abstract]    
Available-for-sale - Equity Securities [1] 6.9 $ 8.9
Available-for-sale – Corporate and Governmental Debt Securities (b) [1] 5.4 [2] 6.2
Cash Equivalents [1] 3.4 2.5
Total Fair Value of Assets 15.7 17.6
Liabilities [Abstract]    
Deferred Compensation [3] 14.8 18.0
Total Fair Value of Liabilities 14.8 18.0
Recurring Fair Value Measures [Member] | Level 1 [Member]    
Investments [Abstract]    
Available-for-sale - Equity Securities [1] 6.9 8.9
Available-for-sale – Corporate and Governmental Debt Securities (b) [1] 0.0 [2] 0.0
Cash Equivalents [1] 3.4 2.5
Total Fair Value of Assets 10.3 11.4
Liabilities [Abstract]    
Deferred Compensation [3] 0.0 0.0
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] 5.4 [2] 6.2
Cash Equivalents [1] 0.0 0.0
Total Fair Value of Assets 5.4 6.2
Liabilities [Abstract]    
Deferred Compensation [3] 14.8 18.0
Total Fair Value of Liabilities 14.8 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 [3] 0.0 0.0
Total Fair Value of Liabilities $ 0.0 $ 0.0
[1] Included in Other Non-Current Assets on the Consolidated Balance Sheet.
[2] As of September 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 $2.6 million, in three years to less than five years was $1.4 million and in five or more years was $0.6 million.
[3] Included in Other Non-Current Liabilities on the Consolidated Balance Sheet.