Consolidated Statements of Changes in Shareholders' Equity (USD $) In Millions, except Share data, unless otherwise specified		Total		Preferred Stock [Member]		Common stock [Member]	Treasury Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]
Balance at beginning of period, Common Stock at Dec. 31, 2009						$ 40.6
Balance at beginning of period, Preferred Stock, less than $0.1 at Dec. 31, 2009	[1]
Balance at beginning of period at Dec. 31, 2009							(560.3)	616.8	1,090.0	(84.5)
Balance at beginning of period, Preferred Stock, less than 0.1, Shares at Dec. 31, 2009	[1]
Balance at beginning of period, Treasury Stock, Shares at Dec. 31, 2009							(19,100,000)
Balance at beginning of period, Common Stock, Shares at Dec. 31, 2009						65,200,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of preferred stock into common stock, Shares	[1]
Conversion of preferred stock into common stock	[1]
Issuance of common stock, Shares						200,000
Issuance of common stock						0.2		2.3
Convertible debt conversions, Shares						100,000
Convertible debt conversions						0.1		(0.1)
Share-based compensation effects								7.2
Net income		80.8							80.8
Dividends declared									(53.9)
Other comprehensive income (loss)		(25.5)								(25.5)
Balance at end of period, Common Stock at Dec. 31, 2010						40.9
Balance at end of period, Preferred Stock, less than $0.1 at Dec. 31, 2010	[1]
Balance at end of period at Dec. 31, 2010		1,113.7					(560.3)	626.2	1,116.9	(110.0)
Balance at end of period, Preferred Stock, less than 0.1, Shares at Dec. 31, 2010	[1]
Balance at end of period, Treasury Stock, Shares at Dec. 31, 2010							(19,100,000)
Balance at end of period, Common Stock, Shares at Dec. 31, 2010						65,500,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of preferred stock into common stock, Shares	[1]
Conversion of preferred stock into common stock	[1]
Issuance of common stock, Shares						300,000
Issuance of common stock						0.2		6.4
Convertible debt conversions, Shares						0
Convertible debt conversions						0		0
Share-based compensation effects								11.8
Net income		110.8							110.8
Dividends declared									(56.5)
Other comprehensive income (loss)		(59.1)								(59.1)
Balance at end of period, Common Stock at Dec. 31, 2011		41.1				41.1
Balance at end of period, Preferred Stock, less than $0.1 at Dec. 31, 2011			[2]		[1]
Balance at end of period at Dec. 31, 2011		1,127.3					(560.3)	644.4	1,171.2	(169.1)
Balance at end of period, Preferred Stock, less than 0.1, Shares at Dec. 31, 2011	[1]
Balance at end of period, Treasury Stock, Shares at Dec. 31, 2011							(19,100,000)
Balance at end of period, Common Stock, Shares at Dec. 31, 2011		65,775,568				65,800,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of preferred stock into common stock, Shares	[1]
Conversion of preferred stock into common stock	[1]
Issuance of common stock, Shares						200,000
Issuance of common stock						0.1		2.9
Convertible debt conversions, Shares						0
Convertible debt conversions						0		0
Share-based compensation effects								11.2
Net income		137.3							137.3
Dividends declared									(59.1)
Other comprehensive income (loss)		24.5								24.5
Balance at end of period, Common Stock at Dec. 31, 2012		41.2				41.2
Balance at end of period, Preferred Stock, less than $0.1 at Dec. 31, 2012			[2]		[1]
Balance at end of period at Dec. 31, 2012		$ 1,244.2						$ 658.5	$ 1,249.4	$ (144.6)
Balance at end of period, Preferred Stock, less than 0.1, Shares at Dec. 31, 2012	[1]
Balance at end of period, Common Stock, Shares at Dec. 31, 2012		66,021,444				66,000,000

[1] Less than $0.1

[2] * Less than $0.1