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Fair Value - Recurring Fair Value Measures (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Investments [Abstract]      
Cash Equivalents $ 24.4   $ 20.7
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 11.9   18.0
Available-for-sale - Corporate Debt Securities 8.5   8.8
Cash Equivalents 24.4   20.7
Total Fair Value of Assets 44.8   47.5
Liabilities [Abstract]      
Deferred Compensation 15.7   14.0
Derivatives - Interest Rate Swap 0.5   0.7
Total Fair Value of Liabilities 16.2   14.7
Total Net Fair Value of Assets (Liabilities) 28.6   32.8
Recurring Fair Value Measurements [Member] | Level 1 [Member]
     
Investments [Abstract]      
Available-for-sale - Equity Securities 11.9   18.0
Available-for-sale - Corporate Debt Securities 0   0
Cash Equivalents 24.4   20.7
Total Fair Value of Assets 36.3   38.7
Liabilities [Abstract]      
Deferred Compensation 0   0
Derivatives - Interest Rate Swap 0   0
Total Fair Value of Liabilities 0   0
Total Net Fair Value of Assets (Liabilities) 36.3   38.7
Recurring Fair Value Measurements [Member] | Level 2 [Member]
     
Investments [Abstract]      
Available-for-sale - Equity Securities 0   0
Available-for-sale - Corporate Debt Securities 8.5   8.8
Cash Equivalents 0   0
Total Fair Value of Assets 8.5   8.8
Liabilities [Abstract]      
Deferred Compensation 15.7   14.0
Derivatives - Interest Rate Swap 0.5   0.7
Total Fair Value of Liabilities 16.2   14.7
Total Net Fair Value of Assets (Liabilities) (7.7)   (5.9)
Recurring Fair Value Measurements [Member] | Level 3 [Member]
     
Investments [Abstract]      
Available-for-sale - Equity Securities 0   0
Available-for-sale - Corporate Debt Securities 0   0
Cash Equivalents 0   0
Total Fair Value of Assets 0   0
Liabilities [Abstract]      
Deferred Compensation 0   0
Derivatives - Interest Rate Swap 0   0
Total Fair Value of Liabilities 0   0
Total Net Fair Value of Assets (Liabilities) $ 0   $ 0