Fair Value Measurements (Details 2) (Contingent consideration, USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2012
Contingent consideration
Changes in liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Balance at beginning of year	$ 25.1
Liabilities recognized at acquisition date	2.4
Loss (gains) recognized in earnings	(2.2)
Settlements	(0.7)
Foreign currency translation	(0.1)
Balance at end of year	$ 24.5

Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

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+ Details