Condensed Consolidated Statements Of Shareholders' Equity (USD $) In Millions, except Share data	Common Stock [Member]	Capital In Excess Of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at beginning of year at Dec. 31, 2011	$ 0.6	$ 1,467.5	$ 77.1	$ (415.0)	$ 1,130.2
Common stock shares, beginning balance at Dec. 31, 2011	58,424,691
Stock issuance	337,368
Share-based employee compensation		11.4			11.4
Net earnings			18.2		18.2
Dividends			(95.3)		(95.3)
Dividends declared in excess of retained earnings		(412.9)			(412.9)
Other comprehensive income (loss)				5.4	5.4
Balance at end of period at Mar. 31, 2012	0.6	1,066.0		(409.6)	657.0
Common stock shares, ending balance at Mar. 31, 2012	58,762,059
Balance at beginning of year at Dec. 31, 2012	0.6	1,076.8	113.1	(471.4)	719.1
Common stock shares, beginning balance at Dec. 31, 2012	58,934,050
Stock issuance	212,198
Share-based employee compensation		5.7			5.7
Net earnings			3.0		3.0
Other comprehensive income (loss)				7.0	7.0	[1]
Balance at end of period at Mar. 31, 2013	$ 0.6	$ 1,082.5	$ 116.1	$ (464.4)	$ 734.8
Common stock shares, ending balance at Mar. 31, 2013	59,146,248

[1] Amounts are net of tax