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Financial instruments and fair value measurements (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Marketable Securities and Financial Instruments on Fair Value Basis
Current	$ 0.8	$ 22.5
Noncurrent	329.9	354.1
Currency forward contracts		(0.8)
Contingent consideration	0.7	0.7
Quoted Prices in Active Markets (Level 1) [Member]
Marketable Securities and Financial Instruments on Fair Value Basis
Current		20.9
Noncurrent	73.7	100.3
Currency forward contracts		(0.8)
Significant Other Observable Inputs (Level 2) [Member]
Marketable Securities and Financial Instruments on Fair Value Basis
Current	0.8	1.6
Noncurrent	6.2	3.8
Currency forward contracts
Significant Unobservable Inputs (Level 3) [Member]
Marketable Securities and Financial Instruments on Fair Value Basis
Noncurrent	250.0	250.0
Currency forward contracts
Contingent consideration	$ 0.7	$ 0.7

X

- Definition

Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents contracts related to the exchange of different currencies, including foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into and existing as of the balance sheet date.

+ References

No definition available.

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- Definition

Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale which are intended to be held for less than one year or the normal operating cycle, whichever is longer.

+ References

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- Definition

Total debt and equity financial instruments including: (1) securities held-to-maturity and (2) securities available-for-sale that will be held for the long-term.

+ References

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