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Financial Instruments (Details 2) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Summary of Contractual Maturities: Available-for-Sale Securities    
Due in one year or less, estimated fair value $ 709.8 $ 620.2
Due in one year or less, amortized cost 709.8 620.2
Due after one year through five years, Estimated Fair Value 931.0 573.1
Due after one year through five years, Amortized Cost 930.3 572.9
Due after five years, estimated fair value 79.8 52.6
Due after five years, amortized cost 79.8 52.7
Total available-for-sale securities, Fair Value 1,720.6 1,245.9
Total available-for-sale securities, Amortized Cost $ 1,719.9 $ 1,245.8