Impairments, Restructuring Charges, and Other Items (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Summary of impairment, restructuring, and other charges
Severance, restructuring costs, and special termination benefits	$ 2.3	$ 1.2
Impairments and restructuring business process re-engineering	0.6	0
Impairments and restructuring Moving costs	0.5	0
Total impairments, restructuring charges, and other items	$ 3.4	$ 1.2