Impairments, Restructuring Charges, and Other Items (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Summary of impairment, restructuring, and other charges
Severance, restructuring costs and special termination benefits	$ 2.6	$ 0.6	$ 3.4	$ 1.8
Business process re-engineering	0.6	0.2	1.3	0.4
Contingent legal liability and settlements	0.5	0.0	0.5	1.5
Environmental reserve for sold building	0.0	0.0	0.0	1.2
Total impairments, restructuring charges, and other items	$ 3.7	$ 0.8	$ 5.2	$ 4.9