Pensions and Postretirement Benefits Other Than Pensions (Schedule of Net Periodic Benefit Cost) (Details) - Pension Costs [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Prior service costs, net amortization of	$ (0.4)
United States Pension Plan of US Entity [Member]
Service cost	9.4	$ 9.5	$ 7.3
Interest cost	9.8	11.0	11.5
Expected return on plan assets	(10.2)	(11.2)	(11.2)
Prior service costs, net amortization of	0.7	0.7	0.7
Plan net actuarial losses, net amortization of	4.7	4.9	2.3
Net periodic benefit cost	14.4	14.9	10.6
Net curtailment and settlement (gains) losses	0.0	0.9	0.0
Net periodic benefit cost after net curtailment and settlement (gains) losses	14.4	15.8	10.6
United States Pension Plan of US Entity, Defined Benefit [Member]
Service cost	3.1	3.3	4.6
Interest cost	10.7	13.7	17.3
Expected return on plan assets	(13.7)	(17.8)	(17.3)
Prior service costs, net amortization of	0.0	0.0	0.1
Plan net actuarial losses, net amortization of	2.2	1.4	2.8
Net periodic benefit cost	2.3	0.6	7.5
Net curtailment and settlement (gains) losses	0.3	0.2	0.0
Net periodic benefit cost after net curtailment and settlement (gains) losses	$ 2.6	$ 0.8	$ 7.5