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Fair Value - Recurring Fair Value Measures (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Liabilities [Abstract]    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value $ 1.0  
Available-for-sale Securities, Debt Maturities, After One Year Through Three Years, Fair Value 2.3  
Available-for-sale Securities, Debt Maturities, After Three Years Through Five Years, Fair Value 2.1  
Available-for-sale Securities, Debt Maturities, After Five Years, Fair Value 0.8  
Recurring Fair Value Measures [Member]    
Investments [Abstract]    
Available-for-sale – Equity Securities 8.9 [1] $ 7.2 [2]
Available-for-sale – Corporate and Governmental Debt Securities 6.2 [1],[3] 10.4 [2]
Cash Equivalents 2.5 [1] 5.5 [2]
Total Fair Value of Assets 17.6 23.1
Liabilities [Abstract]    
Deferred Compensation 18.0 [4] 21.0 [5]
Total Fair Value of Liabilities 18.0 21.0
Total Net Fair Value of Assets (Liabilities) (0.4) 2.1
Fair Value Hierarchy Transfers, All Levels 0.0 0.0
Recurring Fair Value Measures [Member] | Level 1 [Member]    
Investments [Abstract]    
Available-for-sale – Equity Securities 8.9 [1] 7.2 [2]
Available-for-sale – Corporate and Governmental Debt Securities 0.0 [1],[3] 0.0 [2]
Cash Equivalents 2.5 [1] 5.5 [2]
Total Fair Value of Assets 11.4 12.7
Liabilities [Abstract]    
Deferred Compensation 0.0 [4] 0.0 [5]
Total Fair Value of Liabilities 0.0 0.0
Total Net Fair Value of Assets (Liabilities) 11.4 12.7
Recurring Fair Value Measures [Member] | Level 2 [Member]    
Investments [Abstract]    
Available-for-sale – Equity Securities 0.0 [1] 0.0 [2]
Available-for-sale – Corporate and Governmental Debt Securities 6.2 [1],[3] 10.4 [2]
Cash Equivalents 0.0 [1] 0.0 [2]
Total Fair Value of Assets 6.2 10.4
Liabilities [Abstract]    
Deferred Compensation 18.0 [4] 21.0 [5]
Total Fair Value of Liabilities 18.0 21.0
Total Net Fair Value of Assets (Liabilities) (11.8) (10.6)
Recurring Fair Value Measures [Member] | Level 3 [Member]    
Investments [Abstract]    
Available-for-sale – Equity Securities 0.0 [1] 0.0 [2]
Available-for-sale – Corporate and Governmental Debt Securities 0.0 [1],[3] 0.0 [2]
Cash Equivalents 0.0 [1] 0.0 [2]
Total Fair Value of Assets 0.0 0.0
Liabilities [Abstract]    
Deferred Compensation 0.0 [4] 0.0 [5]
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] Included in Other Non-Current Assets on the Consolidated Balance Sheet.
[3] 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.
[4] Included in Other Non-Current Liabilities on the Consolidated Balance Sheet.
[5] Included in Other Non-Current Liabilities on the Consolidated Balance Sheet.