3. Amortized Cost and Fair Value of Debt Securities (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014
Fair Value Disclosures [Abstract]
Mature in less than one year	$ 71.4
Mature in one to five years	118.0
Mature in more than five years	40.2
Total Amortized Cost	229.6
Mature in less than one year	71.5
Mature in one to five years	118.3
Mature in more than five years	40.2
Estimated Fair Value	$ 230.0