Pensions and Postretirement Benefits Other Than Pensions (Schedule of Net Periodic Postretirement Benefit Cost) (Details) (Postretirement Benefit Costs [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Service cost	$ 5.1	$ 6.6	$ 7.3
Interest cost	28.1	26.0	30.8
Prior service gains, net amortization of	(8.9)	(10.3)	(10.3)
Plan net actuarial losses, net amortization of	0	6.5	7.3
Net periodic benefit cost	24.3	28.8	35.1
Net periodic benefit cost after net curtailment and settlement (gains) losses	24.3	28.8	35.1
Segment, Continuing Operations [Member]
Net periodic benefit cost after net curtailment and settlement (gains) losses	16.2	19.8	22.2
Segment, Discontinued Operations [Member]
Net periodic benefit cost after net curtailment and settlement (gains) losses	$ 8.1	$ 9.0	$ 12.9