Debt Outstanding (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Total debt	$ 1,019.9	$ 990.2
Less short-term debt and current maturities	(67.7)	(20.7)
Less unamortized discounts	(1.9)	(2.1)
Plus fair value adjustments	17.5	11.5
Total long-term debt, net	967.8	978.9
Commercial paper
Total debt	50.1
Note, 4.25%, due in installments through March 2012
Total debt		4.7
Notes, 7.34%, due in installments through May 2014
Total debt	45.0	60.0
Notes, 4.45%, due December 2014
Total debt	275.0	275.0
Notes, 6.30%, due July 2017
Total debt	272.5	272.5
Debentures, 6.90%, due July 2028
Total debt	125.0	125.0
Notes, 7.00%, due July 2037
Total debt	250.0	250.0
Capitalized lease obligation
Total debt	1.4	2.0
Other
Total debt	$ 0.9	$ 1.0