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Fair Value - Recurring Fair Value Measures (Details) (USD $)
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Investments [Abstract]      
Cash Equivalents $ 3,400,000 [1]   $ 34,200,000 [1]
Fair Value [Abstract]      
Fair Value Activity in Level 3 0 0  
Fair Value Hierarchy Transfers, All Levels 0 0  
Recurring Fair Value Measurements [Member]
      
Investments [Abstract]      
Available-for-sale - Equity Securities 8,400,000 [2]   7,900,000 [2]
Available-for-sale - Corporate Debt Securities 10,500,000 [2]   9,800,000 [2]
Cash Equivalents 3,400,000 [2]   34,200,000 [2]
Total Fair Value of Assets 22,300,000   51,900,000
Liabilities [Abstract]      
Deferred Compensation 17,800,000 [3]   16,800,000 [3]
Derivatives - Interest Rate Swap 500,000 [4]   600,000 [4]
Total Fair Value of Liabilities 18,300,000   17,400,000
Total Net Fair Value of Assets (Liabilities) 4,000,000   34,500,000
Recurring Fair Value Measurements [Member] | Level 1 [Member]
      
Investments [Abstract]      
Available-for-sale - Equity Securities 8,400,000 [2]   7,900,000 [2]
Available-for-sale - Corporate Debt Securities 0 [2]   0 [2]
Cash Equivalents 3,400,000 [2]   34,200,000 [2]
Total Fair Value of Assets 11,800,000   42,100,000
Liabilities [Abstract]      
Deferred Compensation 0 [3]   0 [3]
Derivatives - Interest Rate Swap 0 [4]   0 [4]
Total Fair Value of Liabilities 0   0
Total Net Fair Value of Assets (Liabilities) 11,800,000   42,100,000
Recurring Fair Value Measurements [Member] | Level 2 [Member]
      
Investments [Abstract]      
Available-for-sale - Equity Securities 0 [2]   0 [2]
Available-for-sale - Corporate Debt Securities 10,500,000 [2]   9,800,000 [2]
Cash Equivalents 0 [2]   0 [2]
Total Fair Value of Assets 10,500,000   9,800,000
Liabilities [Abstract]      
Deferred Compensation 17,800,000 [3]   16,800,000 [3]
Derivatives - Interest Rate Swap 500,000 [4]   600,000 [4]
Total Fair Value of Liabilities 18,300,000   17,400,000
Total Net Fair Value of Assets (Liabilities) (7,800,000)   (7,600,000)
Recurring Fair Value Measurements [Member] | Level 3 [Member]
      
Investments [Abstract]      
Available-for-sale - Equity Securities 0 [2]   0 [2]
Available-for-sale - Corporate Debt Securities 0 [2]   0 [2]
Cash Equivalents 0 [2]   0 [2]
Total Fair Value of Assets 0   0
Liabilities [Abstract]      
Deferred Compensation 0 [3]   0 [3]
Derivatives - Interest Rate Swap 0 [4]   0 [4]
Total Fair Value of Liabilities 0   0
Total Net Fair Value of Assets (Liabilities) $ 0   $ 0
[1] During the first three months of 2014, cash included in Other Investments was transferred to Cash and Cash Equivalents.
[2] Included in Other Investments on the Consolidated Balance Sheet.
[3] Included in Other Non-Current Liabilities on the Consolidated Balance Sheet.
[4] Included in Current Liabilities - Other and Other Non-Current Liabilities on the Consolidated Balance Sheet.