Fair Value (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Dec. 31, 2011
Fair Value [Abstract]
Gains included in earnings relating to contingent consideration obligations outstanding	$ 0.6
Contingent consideration at fair value	8.8	[1]	9.1	[1]
Business acquisition contingent consideration obligations, accounts payable and accrued liabilities	0.5
Business acquisition contingent consideration obligations, other liabilities	$ 8.3

[1] Represents contingent consideration liabilities pursuant to the agreements for certain MA acquisitions which are more fully discussed in Note 7 to the consolidated financial statements