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Description of business and basis of presentation (Tables)

9 Months Ended

Sep. 30, 2012

Description of business and basis of presentation [Abstract]

Summary of the carrying values and estimated fair values of the Company's senior convertible notes due

		September 30, 2012								December 31, 2011
		Carrying value				Estimated fair value				Carrying value				Estimated fair value
Notes due 2013		$	114.3			$	70.8			$	113.9			$	61.0
Notes due 2015		$	97.4			$	57.8			$	96.8			$	60.8

Changes in fair value of the Company's Level 3 forward purchase contract

		Three months end September 30, 2012				Nine months ended September 30, 2012
Beginning Balance		$	—			$	—
Issuance			—				1,080
Adjustments to fair value included in other income (expense)			—				12,011
Transfers to additional paid-in-capital			—				(13,091	)
Ending Balance		$	—			$	—

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- Definition

Schedule of carrying value and estimated fair value of senior notes.

+ References

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- Definition

Tabular disclosure of the fair value measurement of financial instruments classified in shareholders' equity using significant unobservable inputs (level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of level 3 (for example, transfers due to changes in the observability of significant inputs) by class of equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19279-110258

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