Pensions and Postretirement Benefits Other than Pensions (Components of Net Periodic Postretirement Benefit Cost) (Details) - Postretirement Benefit Costs [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Service cost	$ 1.0	$ 1.1	$ 1.9	$ 2.1
Interest cost	4.5	5.9	9.0	11.9
Net amortization of prior service gains	(2.2)	(2.2)	(4.4)	(4.4)
Net amortization of plan net actuarial losses	0.0	0.1	0.0	0.2
Total	3.3	4.9	6.5	9.8
Segment, Continuing Operations [Member]
Total	2.2	3.0	4.3	6.0
Discontinued Operations [Member]
Total	$ 1.1	$ 1.9	$ 2.2	$ 3.8