Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplemental Cash Flow Information [Abstract]
Interest income received	$ 2.2	$ 2.5	$ 2.7
Interest expense paid	20.7	6.9	11.1
Taxes paid net of refunds		24.2	17.0
Net tax refunds	15.9
Payments to employees related to SARs exercises	1.0	5.3	8.2
Capital Expenditures Incurred but Not yet Paid	$ 2.4	$ 3.3	$ 1.8