Employee Benefits, Net Periodic Benefit Costs and Charges Relating To Other Benefit Plans(Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net Periodic Benefit Costs and Charges Relating to Other Benefit Plans
Non-cash net periodic benefit income	$ (22.0)	$ (11.5)	$ (5.7)
Deferred compensation plan	1.2	0.9	0.2
Defined contribution plans	7.9	7.6	7.1
Total	(12.9)	(3.0)	1.6
Fabricated Products
Net Periodic Benefit Costs and Charges Relating to Other Benefit Plans
Total	8.0	7.4	6.4
All Other
Net Periodic Benefit Costs and Charges Relating to Other Benefit Plans
Total	(20.9)	(10.4)	(4.8)
Canadian pension plan
Net Periodic Benefit Costs and Charges Relating to Other Benefit Plans
Non-cash net periodic benefit income	0.5	0.4	0.3
VEBAs
Net Periodic Benefit Costs and Charges Relating to Other Benefit Plans
Non-cash net periodic benefit income	$ (22.5)	$ (11.9)	$ (6.0)