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Goodwill (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Change in the carrying amount of goodwill
Balance at the beginning of the period	$ 1,109.6	$ 1,081.3	$ 1,065.5
Acquisitions	138.5	26.2
Purchase price allocation adjustments	0.2		10.0
Effect of foreign currency translation	(4.0)	1.9	5.8
Consolidation of a joint venture entity		0.2
Balance at the end of the period	$ 1,244.3	$ 1,109.6	$ 1,081.3

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- Definition

Increase in goodwill balance due to the consolidation of a joint venture as required by FAS 167.

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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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The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

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Purchase price allocation adjustment for allocation not yet complete at the prior year end.

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

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