Consolidated Statements of Shareholders’ Equity (USD $) In Millions, unless otherwise specified	Total	Common Stock [Member]	Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]
Balance at Dec. 31, 2010	$ 2,023.1	$ 6.1	$ 751.1	$ 1,108.5	$ 157.4
Balance, shares at Dec. 31, 2010		61.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	74.5			74.5
Other Comprehensive Income (Loss), Net of Tax	100.6				100.6
Cash Dividends to Shareholders	(58.2)			(58.2)
Repurchases of Common Stock	(27.4)	(0.1)	(11.6)	(15.7)
Repurchases of Common Stock, shares	(0.9)	(0.9)
Equity-based Compensation Cost (note 9)	5.3		5.3
Equity-based Awards, Net of Shares Exchanged (note 9)	(1.3)		(0.9)	(0.4)
Equity-based Awards, Net of Shares Exchanged, shares (note 9)		0.1
Balance at Dec. 31, 2011	2,116.6	6.0	743.9	1,108.7	258.0
Balance, shares at Dec. 31, 2011		60.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	103.4			103.4
Other Comprehensive Income (Loss), Net of Tax	54.7				54.7
Cash Dividends to Shareholders	(56.9)			(56.9)
Repurchases of Common Stock	(60.7)	(0.2)	(24.9)	(35.6)
Repurchases of Common Stock, shares	(2.0)	(2.0)
Equity-based Compensation Cost (note 9)	5.8		5.8
Equity-based Awards, Net of Shares Exchanged (note 9)	(1.2)		0.2	(1.4)
Equity-based Awards, Net of Shares Exchanged, shares (note 9)		0.2
Balance at Dec. 31, 2012	2,161.7	5.8	725.0	1,118.2	312.7
Balance, shares at Dec. 31, 2012		58.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	217.7			217.7
Other Comprehensive Income (Loss), Net of Tax	(177.4)				(177.4)
Cash Dividends to Shareholders	(54.9)			(54.9)
Repurchases of Common Stock	(100.4)	(0.2)	(36.8)	(63.4)
Repurchases of Common Stock, shares	(3.0)	(3.0)
Equity-based Compensation Cost (note 9)	5.5		5.5
Equity-based Awards, Net of Shares Exchanged (note 9)	(0.7)		1.1	(1.8)
Equity-based Awards, Net of Shares Exchanged, shares (note 9)		0.2
Balance at Dec. 31, 2013	$ 2,051.5	$ 5.6	$ 694.8	$ 1,215.8	$ 135.3
Balance, shares at Dec. 31, 2013		55.7