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3. Amortized Cost and Fair Value of Debt Securities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mature in less than one year	$ 169.9
Mature in one to five years	197.7
Mature in more than five years	72.1
Total Amortized Cost	439.7
Mature in less than one year	169.9
Mature in one to five years	198.3
Mature in more than five years	73.0
Estimated Fair Value	$ 441.2

X

- Definition

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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