Consolidated Statements Of Stockholders' Equity (USD $) In Millions	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Total
Balance at Dec. 31, 2009	$ 191.0	$ (1,621.9)	$ 161.8	$ 2,323.9	$ (6.5)
Balance, shares at Dec. 31, 2009	191.0	(65.8)
Purchase of treasury stock		(398.8)
Purchase of treasury stock, shares		(19.8)
Issuance of common stock, net		2.7	(4.4)
Issuance of common stock, shares		0.1
Retirement of treasury stock	(45.0)	1,063.9	(17.8)	(1,001.0)
Retirement of treasury stock, shares	(45.0)	45.0
Exercise of stock options		5.1	(1.9)
Exercise of stock options, shares		0.2
Stock-based compensation			9.6
Net (loss) income				206.1		206.1
Cash dividends declared				(26.5)
Other comprehensive income, net of tax					2.2	2.2
Balance at Dec. 31, 2010	146.0	(949.0)	147.3	1,502.5	(4.3)	842.5
Balance, shares at Dec. 31, 2010	146.0	(40.3)
Purchase of treasury stock		(113.3)
Purchase of treasury stock, shares		(7.3)
Issuance of common stock, net		5.1	(6.0)
Issuance of common stock, shares		0.3
Exercise of stock options		14.2	(9.2)
Exercise of stock options, shares		0.6
Stock-based compensation			5.0
Net (loss) income				72.2		72.2
Cash dividends declared				(49.6)
Other comprehensive income, net of tax					(7.6)	(7.6)
Balance at Dec. 31, 2011	146.0	(1,043.0)	137.1	1,525.1	(11.9)	753.3
Balance, shares at Dec. 31, 2011	146.0	(46.7)
Issuance of common stock, net		9.1	(9.7)
Issuance of common stock, shares		0.3
Stock-based compensation			5.9
Net (loss) income				(139.4)		(139.4)
Cash dividends declared				(24.9)
Other comprehensive income, net of tax					4.4	4.4
Balance at Dec. 31, 2012	$ 146.0	$ (1,033.9)	$ 133.3	$ 1,360.8	$ (7.5)	$ 598.7
Balance, shares at Dec. 31, 2012	146.0	(46.4)