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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Level I Approach [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities at fair value $ 12.3 $ 4.9
Level II Approach [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities at fair value 16.1 0.0
Estimated aggregate fair value of the Company's debt $ 387.8 $ 338.1