Consolidated Statements of Shareholders’ Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]
Beginning Balance at Dec. 31, 2012	$ 2,161.7	$ 5.8	$ 725.0	$ 1,118.2	$ 312.7
Beginning 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	85.7			85.7
Other Comprehensive Income	(98.4)				(98.4)
Cash Dividends to Shareholders	(49.7)			(49.7)
Repurchases of Common Stock	$ (43.5)	$ (0.1)	(15.5)	(27.9)
Repurchases of Common Stock, shares	(1.2)	(1.2)
Equity-based Compensation Cost	$ 6.5		6.5
Equity-based Awards, Net of Shares Exchanged	1.1		2.9	(1.8)
Equity-based Awards, Net of Shares Exchanged, shares		0.1
Ending Balance at Dec. 31, 2015	$ 1,992.4	$ 5.1	$ 654.0	$ 1,209.0	$ 124.3
Ending Balance, shares at Dec. 31, 2015		51.3