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Indebtedness (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Debt Instrument [Line Items]
Loss on extinguishment of debt	$ (0.3)
2013 Convertible Notes [Member]
Debt Instrument [Line Items]
Maturity date	Aug. 01, 2013
Prinicipal amount of debt repurchased	70.5
Cash paid to purchase debt	69.5
Total cash consideration for debt repurchase	69.7
Loss on extinguishment of debt	(0.3)
Aggregate amount of debt outstanding	216.4
Interest rate of notes	2.50%
Notes Repurchased [Member] \| 2013 Convertible Notes [Member]
Debt Instrument [Line Items]
Accured and unpaid interest	$ 0.2

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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