Consolidated Statements of Stockholders' Equity (USD $) In Millions, except Share data, unless otherwise specified		Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balance, Stockholders' Equity at Dec. 31, 2011	[1]	$ 375.5	$ 0.3	$ 239.9	$ (32.2)	$ 171.6	$ (4.1)
Beginning Balance, Shares, Issued at Dec. 31, 2011	[1]		24,800,000		2,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	[1]	33.9				33.9
Other comprehensive (loss) income, net of tax	[1]	(2.5)					(2.5)
Dividend declared	[1]	(10.6)				(10.6)
Stock-based compensation expense	[1]	6.2		6.2
Cash proceeds from exercise of common stock options and warrants, shares	[1]		200,000
Cash proceeds from exercise of common stock options and warrants, value	[1]	3.8		3.8
Excess tax deductions associated with stock-based compensation	[1]	1.1		1.1
Issuance of stock based instruments, net of shares withheld for employee taxes, shares	[1]		200,000
Issuance of stock based instruments, net of shares withheld for employee taxes, value	[1]	(2.0)		(2.0)
Repurchase of common stock, shares	[1]				(200,000)
Repurchase of common stock, value	[1]	(5.2)			(5.2)
Ending Balance, Stockholders' Equity at Dec. 31, 2012	[1]	400.2	0.3	249.0	(37.4)	194.9	(6.6)
Ending Balance, Shares, Issued at Dec. 31, 2012	[1]		25,200,000		2,200,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	[1]	41.6				41.6
Other comprehensive (loss) income, net of tax	[1]	0.9					0.9
Dividend declared	[1]	(7.0)				(7.0)
Stock-based compensation expense	[1]	4.6		4.6
Cash proceeds from exercise of common stock options and warrants, shares	[1]		200,000
Cash proceeds from exercise of common stock options and warrants, value	[1]	2.4		2.4
Excess tax deductions associated with stock-based compensation	[1]	2.1		2.1
Issuance of stock based instruments, net of shares withheld for employee taxes, shares	[1]		200,000
Issuance of stock based instruments, net of shares withheld for employee taxes, value	[1]	(3.6)		(3.6)
Repurchase of common stock, shares	[1]				(400,000)
Repurchase of common stock, value	[1]	(7.2)			(7.2)
Ending Balance, Stockholders' Equity at Dec. 31, 2013	[1]	434.0	0.3	254.5	(44.6)	229.5	(5.7)
Ending Balance, Shares, Issued at Dec. 31, 2013	[1]		25,600,000		2,600,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	[1]	42.7				42.7
Other comprehensive (loss) income, net of tax	[1]	(5.9)					(5.9)
Dividend declared	[1]	(10.8)				(10.8)
Stock-based compensation expense	[1]	6.1		6.1
Cash proceeds from exercise of common stock options and warrants, shares	[1]		100,000
Cash proceeds from exercise of common stock options and warrants, value	[1]	2.1		2.1
Excess tax deductions associated with stock-based compensation	[1]	2.8		2.8
Issuance of stock based instruments, net of shares withheld for employee taxes, shares	[1]		100,000
Issuance of stock based instruments, net of shares withheld for employee taxes, value	[1]	(1.7)		(1.7)
Repurchase of common stock, shares	[1]				(200,000)
Repurchase of common stock, value	[1]	(8.0)			(8.0)
Ending Balance, Stockholders' Equity at Dec. 31, 2014	[1]	$ 461.3	$ 0.3	$ 263.8	$ (52.6)	$ 261.4	$ (11.6)
Ending Balance, Shares, Issued at Dec. 31, 2014	[1]		25,800,000		2,800,000

[1] Amounts have been rounded for presentation purposes and might differ from unrounded results.