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]
Beginning Balance at Dec. 31, 2011	$ 2,116.6	$ 6.0	$ 743.9	$ 1,108.7	$ 258.0
Beginning Balance, shares at Dec. 31, 2011		60.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	103.4			103.4
Other Comprehensive Income	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	5.8		5.8
Equity-based Awards, Net of Shares Exchanged	(1.2)		0.2	(1.4)
Equity-based Awards, Net of Shares Exchanged, shares		0.2
Ending Balance at Dec. 31, 2012	2,161.7	5.8	725.0	1,118.2	312.7
Ending Balance, shares at Dec. 31, 2012		58.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	217.7			217.7
Other Comprehensive Income	(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	5.5		5.5
Equity-based Awards, Net of Shares Exchanged	(0.7)		1.1	(1.8)
Equity-based Awards, Net of Shares Exchanged, shares		0.2
Ending Balance at Dec. 31, 2013	2,051.5	5.6	694.8	1,215.8	135.3
Ending Balance, shares at Dec. 31, 2013		55.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	114.5			114.5
Other Comprehensive Income	87.4				87.4
Cash Dividends to Shareholders	(51.8)			(51.8)
Repurchases of Common Stock	(115.5)	(0.4)	(40.2)	(74.9)
Repurchases of Common Stock, shares	(3.2)	(3.2)
Equity-based Compensation Cost	6.4		6.4
Equity-based Awards, Net of Shares Exchanged	(1.8)		(0.9)	(0.9)
Equity-based Awards, Net of Shares Exchanged, shares		(0.1)
Ending Balance at Dec. 31, 2014	$ 2,090.7	$ 5.2	$ 660.1	$ 1,202.7	$ 222.7
Ending Balance, shares at Dec. 31, 2014		52.4