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Fair Value - Recurring Fair Value Measures (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Investments [Abstract]    
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value $ 1.5  
Available-for-sale Securities, Debt Maturities, After One Year Through Three Years, Fair Value 3.4  
Available-for-sale Securities, Debt Maturities, After Three Years Through Five Years, Fair Value 3.0  
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] 9.2 $ 7.2
Available-for-sale – Corporate and Governmental Debt Securities (b) [1] 8.4 [2] 10.4
Cash Equivalents [1] 2.8 5.5
Total Fair Value of Assets 20.4 23.1
Liabilities [Abstract]    
Deferred Compensation [3] 21.5 21.0
Total Fair Value of Liabilities 21.5 21.0
Total Net Fair Value of Assets (Liabilities) (1.1) 2.1
Recurring Fair Value Measures [Member] | Level 1 [Member]    
Investments [Abstract]    
Available-for-sale - Equity Securities [1] 9.2 7.2
Available-for-sale – Corporate and Governmental Debt Securities (b) [1] 0.0 [2] 0.0
Cash Equivalents [1] 2.8 5.5
Total Fair Value of Assets 12.0 12.7
Liabilities [Abstract]    
Deferred Compensation [3] 0.0 0.0
Total Fair Value of Liabilities 0.0 0.0
Total Net Fair Value of Assets (Liabilities) 12.0 12.7
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] 8.4 [2] 10.4
Cash Equivalents [1] 0.0 0.0
Total Fair Value of Assets 8.4 10.4
Liabilities [Abstract]    
Deferred Compensation [3] 21.5 21.0
Total Fair Value of Liabilities 21.5 21.0
Total Net Fair Value of Assets (Liabilities) (13.1) (10.6)
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
Total Net Fair Value of Assets (Liabilities) $ 0.0 $ 0.0
[1] Included in Other Non-Current Assets on the Consolidated Balance Sheet.
[2] As of September 30, 2021, the aggregate amount of available-for-sale corporate and governmental debt securities maturing in one year or less was $1.5 million, in one year to less than three years was $3.4 million, in three years to less than five years was $3.0 million and in five or more years was $0.5 million.
[3] Included in Other Non-Current Liabilities on the Consolidated Balance Sheet.