3. Fair Value Measurements Amortized Cost and Fair Value of Debt Securities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mature in less than one year	$ 97.5
Mature in one to five years	109.1
Mature in more than five years	39.5
Total Amortized Cost	246.1
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mature in less than one year	97.6
Mature in one to five years	109.2
Mature in more than five years	38.9
Estimated Fair Value	$ 245.7