Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements of Comprehensive Income [Abstract]
Net earnings available to common stockholders	$ 149.1	$ 255.9	$ 244.3
Other comprehensive income, net of taxes:
Recognition of deferred pension items, net of taxes of $1.0 in 2011, $(1.8) in 2010, and $3.6 in 2009	4.7	22.5	(10.2)
Unrealized (losses) gains on derivative instruments, net of taxes of $0.7 in 2011, $0.4 in 2010, $0.5 in 2009	(1.4)	(0.6)	(0.9)
Unrealized (losses) gains on available-for-sale securities, reclassified to net earnings, net of taxes of $(2.6) in 2010 and$2.6 in 2009	(1.4)	(4.4)	4.4
Foreign currency translation, net of taxes	(38.1)	(15.1)	71.6
Comprehensive income, net of income taxes	$ 114.3	$ 258.3	$ 309.2