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Debt (Details 1) (Convertible subordinated notes [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Convertible subordinated notes [Member]
Total interest expenses recognized on the convertible subordinated notes
Coupon rate interest	$ 4.4	$ 4.4
Amortized debt discount	3.0	2.7
Total interest expenses recognized on the convertible subordinated notes	$ 7.4	$ 7.1

The component of interest expense representing the noncash expenses charged against earnings in the period to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate caption: Noncash Interest Expense.

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