Restructuring and Integration Costs (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010 item	Dec. 31, 2012
Restructuring and Integration Costs
Total cost recorded in connection with the plan		$ 9.3
Number of positions eliminated		105
Restructuring reserve	2.0		0.6
Restructuring and integration costs	4.4	21.6
Employee termination benefits	2.4	6.9
Integration costs	$ 2.0	$ 14.7