Fair Value Measurements (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Fair value of contingent consideration obligations
Fair value, beginning of period	$ 269.9	$ 82.4	$ 151.0	$ 81.2
Additions	4.6		122.2
Changes in fair value	12.9	2.2	14.2	3.4
Payments	(6.5)		(6.5)
Fair value, end of period	$ 280.9	$ 84.6	$ 280.9	$ 84.6

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

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+ Details