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Fair Value - Recurring Fair Value Measures (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Investments [Abstract]    
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value $ 3.8  
Available-for-sale Securities, Debt Maturities, After One Year Through Three Years, Fair Value 5.0  
Available-for-sale Securities, Debt Maturities, After Three Years Through Five Years, Fair Value 1.0  
Available-for-sale Securities, Debt Maturities, After Five Years, Fair Value 0.0  
Recurring Fair Value Measures [Member]    
Investments [Abstract]    
Available-for-sale – Equity Securities [1] 10.1 $ 11.1
Available-for-sale – Corporate and Governmental Debt Securities (b) [1] 9.8 [2] 9.7
Cash Equivalents [1] 0.8 0.9
Total Fair Value of Assets 20.7 21.7
Liabilities [Abstract]    
Deferred Compensation [3] 20.0 21.2
Total Fair Value of Liabilities 20.0 21.2
Total Net Fair Value of Assets (Liabilities) 0.7 0.5
Recurring Fair Value Measures [Member] | Level 1 [Member]    
Investments [Abstract]    
Available-for-sale – Equity Securities [1] 10.1 11.1
Available-for-sale – Corporate and Governmental Debt Securities (b) [1] 0.0 [2] 0.0
Cash Equivalents [1] 0.8 0.9
Total Fair Value of Assets 10.9 12.0
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) 10.9 12.0
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] 9.8 [2] 9.7
Cash Equivalents [1] 0.0 0.0
Total Fair Value of Assets 9.8 9.7
Liabilities [Abstract]    
Deferred Compensation [3] 20.0 21.2
Total Fair Value of Liabilities 20.0 21.2
Total Net Fair Value of Assets (Liabilities) (10.2) (11.5)
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 June 30, 2020, the aggregate amount of available-for-sale corporate and governmental debt securities maturing in one year or less was $3.8 million, in one year to less than three years was $5.0 million, in three years to less than five years was $1.0 million and in five or more years was zero.
[3] Included in Other Non-Current Liabilities on the Consolidated Balance Sheet.