This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 35

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415241&loc=d3e4534-113899

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 20

-Section 55

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11149-113907

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 20

-Section 55

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11178-113907

Consolidated Statements of Changes in Stockholders' Equity (USD $) In Millions, except Share data, unless otherwise specified	Total	Common Stock Issued [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2011	$ 475.9us-gaap_StockholdersEquity	$ 3.8	$ 211.7	$ (132.1)	$ 417.0	$ (24.5)
Balance (in shares) at Dec. 31, 2011		37,587,298		5,220,414
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	79.8us-gaap_NetIncomeLoss				79.8
Other comprehensive income (loss), net of tax	9.1					9.1
Dividends declared	(14.1)us-gaap_DividendsCommonStockCash				(14.1)
Restricted stock issuances, net (in shares)				137,026
Restricted stock issuances, net	0		(3.4)	3.4
Stock-based employee compensation expense	6.9		6.9
Excess tax benefits of stock-based employee compensation	1.4		1.4
Stock issued to directors as compensation (in shares)		1,778
Stock issued to directors as compensation	0		0
Issuance of shares for options exercised (in shares)		176,900
Issuance of shares for options exercised	2.8		2.8
Share reissuance and cancellation to fulfill stock split (in shares)		(6,556,110)		(6,556,110)
Share reissuance and cancellation to fulfill stock split	0	(0.7)	(178.4)	178.4	0.7
Purchases and cancellation of treasury stock (in shares)				1,481,482
Purchases and cancellation of treasury stock	(50.0)			(50.0)
Balance at Dec. 31, 2012	511.8us-gaap_StockholdersEquity	3.1	41.0	(0.3)	483.4	(15.4)
Balance (in shares) at Dec. 31, 2012		31,209,866		8,760
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	76.1us-gaap_NetIncomeLoss				76.1
Other comprehensive income (loss), net of tax	10.4					10.4
Dividends declared	(39.5)us-gaap_DividendsCommonStockCash				(39.5)
Restricted stock issuances, net (in shares)		226,461		5,000
Restricted stock issuances, net	0		(0.2)	0.2
Stock-based employee compensation expense	3.2		3.2
Excess tax benefits of stock-based employee compensation	0.5		0.5
Stock issued to directors as compensation (in shares)		1,318
Stock issued to directors as compensation	0.1		0.1
Issuance of shares for options exercised (in shares)		33,000
Issuance of shares for options exercised	0.5		0.5
Share reissuance and cancellation to fulfill stock split (in shares)		(47,218)		(47,218)
Share reissuance and cancellation to fulfill stock split	0	0	(1.8)	1.8
Purchases and cancellation of treasury stock (in shares)				43,458
Purchases and cancellation of treasury stock	(1.7)			(1.7)
Balance at Dec. 31, 2013	561.4us-gaap_StockholdersEquity	3.1	43.3	0	520.0	(5.0)
Balance (in shares) at Dec. 31, 2013		31,423,427		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	89.7us-gaap_NetIncomeLoss				89.7
Other comprehensive income (loss), net of tax	(71.5)					(71.5)
Dividends declared	(44.5)us-gaap_DividendsCommonStockCash				(44.5)
Restricted stock issuances, net (in shares)		201,005
Restricted stock issuances, net	0		0
Stock-based employee compensation expense	5.8		5.8
Excess tax benefits of stock-based employee compensation	0.6		0.6
Stock issued to directors as compensation (in shares)		2,902
Stock issued to directors as compensation	0.1		0.1
Purchases and cancellation of treasury stock (in shares)		1,161,812
Purchases and cancellation of treasury stock	(52.6)	(0.1)			(52.5)
Balance at Dec. 31, 2014	$ 489.0us-gaap_StockholdersEquity	$ 3.0	$ 49.8	$ 0	$ 512.7	$ (76.5)
Balance (in shares) at Dec. 31, 2014		30,465,522		0