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3. Amortized Cost and Fair Value of Debt Securities (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Carrying (Reported) Amount, Fair Value Disclosure [Member]
 
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Mature in less than one year $ 130.8
Mature in one to five years 184.1
Mature in more than five years 46.7
Total Amortized Cost 361.6
Estimate of Fair Value, Fair Value Disclosure [Member]
 
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Mature in less than one year 130.8
Mature in one to five years 184.4
Mature in more than five years 47.0
Estimated Fair Value $ 362.2