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 Income (Loss) [Member]
Balance at beginning of period, Common Stock at Dec. 31, 2010					$ 40.9
Balance at beginning of period, Preferred Stock, less than $0.1 at Dec. 31, 2010	[1]
Balance at beginning of period at Dec. 31, 2010						(560.3)	626.2	1,116.9	(110.0)
Balance at beginning of period, Preferred Stock, less than 0.1, Shares at Dec. 31, 2010	[1]
Balance at beginning of year at Dec. 31, 2010					65,500,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period, Shares						(19,100,000)
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
Stock repurchases		0
Convertible debt conversions							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
Balance at end of period, Preferred Stock, less than $0.1 at Dec. 31, 2011	[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, Common Stock, Shares at Dec. 31, 2011					65,800,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period, Shares						(19,100,000)
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
Stock repurchases		0
Convertible debt conversions							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				[1]
Balance at end of period at Dec. 31, 2012		1,244.2				(560.3)	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
Balance at beginning of period at Sep. 30, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period, Shares						(19,100,000)
Net income		29.7
Balance at end of period, Common Stock at Dec. 31, 2012		41.2			41.2
Balance at end of period at Dec. 31, 2012		1,244.2				(560.3)	658.5	1,249.4	(144.6)
Balance at end of period, Preferred Stock, less than $0.1 at Dec. 31, 2012				[1]
Balance at end of period, Common Stock, Shares at Dec. 31, 2012		66,021,444			66,000,000
Balance at beginning of period, Preferred Stock, less than 0.1, Shares at Dec. 31, 2012	[1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period, Shares						(20,500,000)
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					0.1		1.1
Stock repurchases, Shares		(1,358,688)
Stock repurchases		(68.6)
Convertible debt conversions							0
Share-based compensation effects							9.3
Net income		169.3						169.3
Dividends declared								60.3
Other comprehensive income (loss)		101.9							101.9
Balance at end of period, Common Stock at Dec. 31, 2013		41.3			41.3
Balance at end of period, Preferred Stock, less than $0.1 at Dec. 31, 2013	[1]
Balance at end of period at Dec. 31, 2013		1,397.0				(628.9)	668.9	1,358.4	(42.7)
Balance at end of period, Preferred Stock, less than 0.1, Shares at Dec. 31, 2013	[1]
Balance at end of period, Common Stock, Shares at Dec. 31, 2013		66,349,906			66,300,000
Balance at beginning of period at Sep. 30, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period, Shares						(20,500,000)
Net income		53.3
Balance at end of period at Dec. 31, 2013		1,397.0				(628.9)
Balance at end of period, Common Stock at Dec. 31, 2013		$ 41.3
Balance at end of period, Common Stock, Shares at Dec. 31, 2013		66,349,906

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