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, 2014		Dec. 31, 2013		Dec. 31, 2012
Net Periodic Benefit Costs and Charges Relating to Other Benefit Plans
Non-cash net periodic benefit income	$ (23.5)		$ (22.0)		$ (11.5)
Total	(14.4)		(12.9)		(3.0)
Fabricated Products
Net Periodic Benefit Costs and Charges Relating to Other Benefit Plans
Deferred compensation plan	0.2		0.3		0.2
Defined contribution plans	7.3		7.2		6.8
Total	7.8	[1]	8.0	[1]	7.4	[1]
All Other
Net Periodic Benefit Costs and Charges Relating to Other Benefit Plans
Deferred compensation plan	0.7		0.9		0.8
Defined contribution plans	0.8		0.7		0.7
Total	(22.2)		(20.9)		(10.4)
Canadian pension plan | Fabricated Products
Net Periodic Benefit Costs and Charges Relating to Other Benefit Plans
Non-cash net periodic benefit income	0.3		0.5		0.4
VEBAs | All Other
Net Periodic Benefit Costs and Charges Relating to Other Benefit Plans
Non-cash net periodic benefit income	$ (23.7)	[2]	$ (22.5)	[2]	$ (11.9)	[2]

[1] Substantially all of the Fabricated Products segment’s employee benefits related charges are in Cost of products sold, excluding depreciation and amortization and other items with the remaining balance in Selling, administrative, research and development and general.

[2] Included within the Statements of Consolidated Income as Net periodic pension benefit income relating to VEBAs.