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3. Fair Value Measurements Amortized Cost and Fair Value of Debt Securities (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Fair Value Disclosures [Abstract]  
Mature in less than one year $ 104.9
Mature in one to five years 143.0
Mature in more than five years 50.3
Total Amortized Cost 298.2
Mature in less than one year 104.8
Mature in one to five years 142.7
Mature in more than five years 50.0
Estimated Fair Value $ 297.5