Fair Value Measurements (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Fair value of contingent consideration obligations
Fair value, beginning of period	$ 280.9	$ 84.6	$ 151.0	$ 81.2
Additions	0	38.8	122.2	38.8
Changes in fair value	9.4	2.5	23.6	5.9
Payments	0	0	(6.5)	0
Fair value, end of period	$ 290.3	$ 125.9	$ 290.3	$ 125.9

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

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+ Details