Pensions and Postretirement Benefits Other than Pensions (Components of Net Periodic Postretirement Benefit Cost) (Details) (Postretirement Benefit Costs [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Service cost	$ 1.0	$ 1.3
Interest cost	6.0	7.3
Net amortization of prior service gains	(2.2)	(2.2)
Net amortization of plan net actuarial losses	0.1	0
Total	4.9	6.4
Segment, Continuing Operations [Member]
Total	3.0	4.2
Discontinued Operations [Member]
Total	$ 1.9	$ 2.2