Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Net earnings available to common stockholders	$ 73.7	$ 76.5	$ 198.4	$ 204.6
Other comprehensive income, net of income taxes:
Recognition of deferred pension items, net of taxes of $0.3 for the three months ended September 30, 2011, $0.5 for the three months ended September 30, 2010, $1.0 for the nine months ended September 30, 2011 and $1.2 for the nine months ended September 30, 2010	2.1	2.2	4.2	5.8
Unrealized (losses) gains on derivative instruments, net of taxes of $0.1 for the three months ended September 30, 2011, $(0.1) for the three months ended September 30, 2010, $0.3 for the nine months ended September 30, 2011 and $0.1 for the nine months ended September 30, 2010	(0.1)	0.2	(0.4)	(0.1)
Unrealized losses on available-for-sale securities, reclassified to net earnings, net of taxes of $0.1 in 2010				(0.1)
Unrealized gains on available-for-sale securities, net of taxes of $0.1 in 2010				0.3
Foreign currency translation adjustments	(97.9)	108.3	(12.8)	20.3
Comprehensive (loss) income, net of income taxes	$ (22.2)	$ 187.2	$ 189.4	$ 230.8