Retirement Plans and Post Retirement Benefits Pension Costs, Assumptions Used in Net Periodic Costs and Expected Contributions and Payments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 2.6	$ 4.9	$ 4.3
Interest cost	11.1	12.5	13.1
Expected return on plan assets	(13.9)	(13.1)	(13.1)
Amortization of prior service cost	0.5	0.5	0.5
Amortization of net actuarial loss	6.3	6.2	5.4
Net periodic pension cost before settlement	6.6	11.0	10.2
Loss due to settlement	0.1	3.1	0.0
Net periodic pension cost	6.7	14.1	10.2
Net periodic pension cost included in cost of sales	1.6	3.6	3.2
Net periodic pension cost included in selling, general, and administrative expenses	1.0	1.3	1.1
Net periodic pension cost included in other non-operating items	$ 4.1	$ 9.2	$ 5.9
Defined Benefit, Canadian Plans [Member]
Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.30%	3.70%	3.80%
Expected return on plan assets	4.10%	3.80%	3.80%
Rate of compensation increase	3.50%	3.50%	3.50%
Defined Benefit, SERP [Member]
Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate		2.70%	2.80%
Rate of compensation increase		3.00%	3.00%
Defined Benefit, US Plans [Member]
Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.50%	4.00%	4.20%
Expected return on plan assets	5.80%	5.80%	5.80%