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Convertible Notes Payable - Payment of 2013 Convertible Notes (Details) (Point Two Five Percent Convertible Senior Notes Due 2013 [Member], USD $) In Millions, unless otherwise specified		0 Months Ended
	Apr. 30, 2013	May 02, 2013 Subsequent Event [Member]
Debt Instrument [Line Items]
Repayments of 2013 convertible notes at maturity		$ 216.2
Interest rate on convertible notes	0.25%	0.25%

The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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