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Financial Instruments (Details 2) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Summary of Contractual Maturities: Available-for-Sale Securities    
Due in one year or less, estimated fair value $ 675.1 $ 620.2
Due in one year or less, amortized cost 675.0 620.2
Due after one year through five years, Estimated Fair Value 1,262.0 573.1
Due after one year through five years, Amortized Cost 1,261.8 572.9
Due after five years, estimated fair value 109.3 52.6
Due after five years, amortized cost 109.1 52.7
Total available-for-sale securities, Fair Value 2,046.4 1,245.9
Total available-for-sale securities, Amortized Cost $ 2,045.9 $ 1,245.8