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Summary of significant accounting policies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 M	Dec. 31, 2011 D segment	Dec. 31, 2010	Dec. 31, 2009
Summary of significant accounting policies
Number of reportable segments	3	3
Foreign currency translation
Transactional foreign currency gains and (losses), including those generated from intercompany operations		$ (1.6)	$ (0.1)	$ (0.5)
Cash and cash equivalents
Maximum term of original maturity to classify instruments as cash equivalents (in days/months)	3	90

The aggregate foreign currency transaction gain (loss) (both realized and unrealized) included in determining net income for the reporting period. Excludes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. For certain enterprises, primarily banks, that are dealers in foreign exchange, foreign currency transaction gains (losses) may be disclosed as dealer gains (losses).

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