Investments (Details 1) (Debt Securities [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2014
Debt Securities [Member]
Contractual maturities for available-for-sale securities
Due in one year or less, Cost	$ 13.4
Due in one to five years, Cost	42.9
Total Cost	56.3
Due in one year or less, Fair Value	13.5
Due in one to five years, Fair Value	42.8
Total Fair Value	$ 56.3