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Goodwill (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Summarizes the goodwill movement
At January 1, Gross cost	$ 384.2	$ 375.5
At January 1, Accumulated impairment losses	(235.2)	(234.0)
At January 1, Net book amount	149.0	141.5
Exchange effect	(0.1)	0
Impairment losses	(0.3)	(0.3)
At March 31, Gross cost	384.1	375.5
At March 31, Accumulated impairment losses	(235.5)	(234.3)
At March 31, Net book amount	$ 148.6	$ 141.2

X

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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Gross amount, as of the balance sheet date, of the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable), in excess of the fair value of net assets acquired in one or more business combination transactions.

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The accumulated impairment losses related to goodwill as of the balance sheet date.

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Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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The increase (decrease) to the recorded value of goodwill for foreign currency translation adjustments.

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