Employee Benefit Plans (Net Periodic Cost For Pension And Postretirement Benefit Plans) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2.3		$ 2.4
Interest cost	11.6		12.3
Expected return on plan assets	(13.0)		(13.1)
Net amortization	6.7		5.0
Curtailment loss (gain)	0	[1]	0.1	[1]
Net periodic cost	7.6		6.7
Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.3		0.3
Interest cost	2.3		2.8
Expected return on plan assets	(0.5)		(0.7)
Net amortization	0.5		(1.8)
Curtailment loss (gain)	0	[1]	(1.1)	[1]
Net periodic cost	2.6		(0.5)
Building Block Chemicals [Member]
Defined Benefit Plan Disclosure [Line Items]
Curtailment loss (gain)			$ 1.0

[1] Net curtailment gain of $1.0 resulted from the sale of the Building Block Chemicals segment in the first quarter of 2011, and is included in gain on sale of discontinued operations, net of tax in the consolidated statements of income.