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Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Intangible assets
Gross cost at January 1			$ 51.2	$ 48.1
Capitalization of internally developed software and other costs			3.5	0
Exchange effect			0	0.2
Gross cost at June 30	54.7	48.3	54.7	48.3
Accumulated amortization at January 1			(33.5)	(29.1)
Amortization expense	(1.0)	(1.1)	(2.0)	(2.3)
Exchange effect			(0.1)	(0.1)
Accumulated amortization at June 30	(35.6)	(31.5)	(35.6)	(31.5)
Net book amount at June 30	$ 19.1	$ 16.8	$ 19.1	$ 16.8	$ 17.7

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- Definition

Amount of increase (decrease) to amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life for foreign currency translation adjustments.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Additions made to capitalized computer software costs during the period.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of increase (decrease) to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for foreign currency translation adjustments.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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