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Income taxes (Details 4) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]
U.S. Federal Net Operating Loss	$ 183.8
U.S. State Net Operating Loss	14.8
Foreign Net Operating Losses	60.4
U.S. Tax Credits	45.9
U.S. Alternative Minimum Tax Credit	0.3
Total operating loss and tax credit carry forwards	$ 305.2

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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