Consolidated Statements Of Changes In Stockholders' Equity (USD $) In Millions, unless otherwise specified	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at Dec. 31, 2008	$ 0.8	$ (58.4)	$ 1,264.1	$ 229.5	$ (51.8)	$ 1,384.2
Balance, Shares at Dec. 31, 2008	78.4	(2.8)
Net income				128.7		128.7
Comprehensive Income:
Cumulative translation adjustment					39.1	39.1
Derivative transactions and other, net					(16.3)	(16.3)
Accrued benefit costs, net					8.1	8.1
Comprehensive income						159.6
Proceeds from issuance of common stock, net	0.1		202.6			202.7
Proceeds from issuance of common stock, net, shares	12.0
Restricted stock awards, stock options exercised and stock plan purchases		57.7	(49.1)			8.6
Restricted stock awards, stock options exercised and stock plan purchases, shares		2.8
Restricted stock awards cancelled and shares tendered for stock options and taxes		(18.6)	1.9			(16.7)
Restricted stock awards cancelled and shares tendered for stock options and taxes, shares		(0.7)
Dividends declared				(13.5)		(13.5)
Stock-based compensation			41.3			41.3
Other		0.6				0.6
Other, shares	0.5
Balance at Dec. 31, 2009	0.9	(18.7)	1,460.8	344.7	(20.9)	1,766.8
Balance, shares at Dec. 31, 2009	90.9	(0.7)				12.0
Net income				106.7		106.7
Comprehensive Income:
Cumulative translation adjustment					1.2	1.2
Derivative transactions and other, net					2.6	2.6
Accrued benefit costs, net					(7.7)	(7.7)
Comprehensive income						102.8
Restricted stock awards, stock options exercised and stock plan purchases		44.6	(36.3)			8.3
Restricted stock awards, stock options exercised and stock plan purchases, shares	1.8	1.5
Restricted stock awards cancelled and shares tendered for stock options and taxes		(9.9)	1.4			(8.5)
Restricted stock awards cancelled and shares tendered for stock options and taxes, shares		(0.3)
Dividends declared				(30.4)		(30.4)
Stock-based compensation			24.3			24.3
Shares repurchased		(42.8)				(42.8)
Shares repurchased, shares		(1.4)
Balance at Dec. 31, 2010	0.9	(26.8)	1,450.2	421.0	(24.8)	1,820.5
Balance, shares at Dec. 31, 2010	92.7	(0.9)
Net income				204.7		204.7
Comprehensive Income:
Cumulative translation adjustment					(25.4)	(25.4)
Derivative transactions and other, net					13.3	13.3
Accrued benefit costs, net					(19.8)	(19.8)
Comprehensive income						172.8
Restricted stock awards, stock options exercised and stock plan purchases		75.1	(53.2)			21.9
Restricted stock awards, stock options exercised and stock plan purchases, shares		2.3
Restricted stock awards cancelled and shares tendered for stock options and taxes		(23.4)	3.8			(19.6)
Restricted stock awards cancelled and shares tendered for stock options and taxes, shares		0.7
Dividends declared				(31.3)		(31.3)
Stock-based compensation			23.8			23.8
Shares repurchased		(76.1)				(76.1)
Shares repurchased, shares		(2.5)
Balance at Dec. 31, 2011	$ 0.9	$ (51.2)	$ 1,424.6	$ 594.4	$ (56.7)	$ 1,912.0
Balance, shares at Dec. 31, 2011	92.7	(1.8)