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3. Amortized Cost and Fair Value of Debt Securities (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Mature in less than one year $ 172.8
Mature in one to five years 194.8
Mature in more than five years 73.5
Total Amortized Cost 441.1
Mature in less than one year 172.9
Mature in one to five years 194.7
Mature in more than five years 72.4
Estimated Fair Value $ 440.0