Consolidated Statement of Shareholders' Equity (USD $) In Millions, except Share data, unless otherwise specified		Total	Common Stock	Additional Paid-In Capital	Deferred Compensation Equity	Accumulated Other Comprehensive Income	Retained Earnings	Shares in Treasury
Balance at Dec. 31, 2010		$ 1,340.7	$ 78.7	$ 92.4		$ (38.1)	$ 1,429.3	$ (221.6)
Balance (in shares) at Dec. 31, 2010			61,024,932					17,011,676
Increase (Decrease) in Shareholders' Equity
Net income		180.3					180.3
Other comprehensive income, net of tax		(6.9)				(6.9)
Cash dividends - $0.84, $0.76 and $0.70 per share for the year ended 2013, 2012 and 2011 respectively		(43.5)					(43.5)
Stock based compensation other	[1]	29.5		27.8				1.7
Stock based compensation other (in shares)	[1]		639,881					(543,916)
Balance at Dec. 31, 2011		1,500.1	78.7	120.2		(45.0)	1,566.1	(219.9)
Balance (in shares) at Dec. 31, 2011			61,664,813					16,467,760
Increase (Decrease) in Shareholders' Equity
Net income		270.2					270.2
Other comprehensive income, net of tax		9.5				9.5
Cash dividends - $0.84, $0.76 and $0.70 per share for the year ended 2013, 2012 and 2011 respectively		(48.0)					(48.0)
Stock based compensation other	[1]	56.3		51.2	0.6			4.5
Stock based compensation other (in shares)	[1]		1,462,486					(1,218,046)
Balance at Dec. 31, 2012		1,788.1	78.7	171.4	0.6	(35.5)	1,788.3	(215.4)
Balance (in shares) at Dec. 31, 2012		63,127,299	63,127,299					15,249,714
Increase (Decrease) in Shareholders' Equity
Net income		209.7					209.7
Other comprehensive income, net of tax		4.0				4.0
Cash dividends - $0.84, $0.76 and $0.70 per share for the year ended 2013, 2012 and 2011 respectively		(53.7)					(53.7)
Stock based compensation other	[1]	38.0		29.7	2.4			5.9
Stock based compensation other (in shares)	[1]		531,478					(488,233)
Balance at Dec. 31, 2013		$ 1,986.1	$ 78.7	$ 201.1	$ 3.0	$ (31.5)	$ 1,944.3	$ (209.5)
Balance (in shares) at Dec. 31, 2013		63,658,777	63,658,777					14,761,481

[1] Stock based compensation includes stock option activity, net of tax, and restricted share activity