Statement of Consolidated Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Beginning balance, shares at Dec. 31, 2012		19,313,235
Beginning balance at Dec. 31, 2012	$ 1,070.8	$ 0.2	$ 1,017.7	$ 151.2	$ (72.3)	$ (26.0)
Stockholders' Equity [Roll Forward]
Net (loss) income	104.8			104.8
Other comprehensive income, net of tax	5.3					5.3
Issuance of non-vested shares to employees		76,336
Issuance of common shares to directors, shares		2,916
Issuance of common shares to non-employee directors	0.2		0.2
Issuance of common shares to employees upon vesting of restricted stock units and performance shares		36,503
Cancellation of employee non-vested shares		(820)
Cancellation of shares to cover employees’ tax withholdings upon vesting of non-vested shares, shares		(40,075)
Cancellation of shares to cover employees’ tax withholdings upon vesting of non-vested shares	$ (2.5)		(2.5)
Repurchase of common stock, shares	0	(1,232,077)
Repurchase of common stock	$ (79.3)				(79.3)
Shares returned from distribution of third-party trust, shares	(9,001)
Distribution from third party trust				0.6	(0.6)
Cash dividends on common stock	$ (23.0)			(23.0)
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest	1.1		1.1
Amortization of unearned equity compensation	6.6		6.6
Restricted Stock Award, Forfeitures, Dividends	0.2			0.2
Ending balance, shares at Dec. 31, 2013		18,147,017
Ending balance at Dec. 31, 2013	1,084.2	$ 0.2	1,023.1	233.8	(152.2)	(20.7)
Stockholders' Equity [Roll Forward]
Net (loss) income	71.8			71.8
Other comprehensive income, net of tax	(75.4)					(75.4)
Issuance of non-vested shares to employees		119,799
Issuance of common shares to directors, shares		2,969
Issuance of common shares to non-employee directors	0.2		0.2
Issuance of common shares to employees upon vesting of restricted stock units and performance shares		44,895
Cancellation of employee non-vested shares		(40,503)
Cancellation of shares to cover employees’ tax withholdings upon vesting of non-vested shares, shares		(33,696)
Cancellation of shares to cover employees’ tax withholdings upon vesting of non-vested shares	$ (2.4)		(2.4)
Repurchase of common stock, shares	(633,230)	(633,230)
Repurchase of common stock	$ (44.9)				(44.9)
Cash dividends on common stock	(25.4)			(25.4)
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest	0.8		0.8
Amortization of unearned equity compensation	6.8		6.8
Restricted Stock Award, Forfeitures, Dividends	$ 0.2			0.2
Ending balance, shares at Dec. 31, 2014	17,607,251	17,607,251
Ending balance at Dec. 31, 2014	$ 1,015.9	$ 0.2	1,028.5	280.4	(197.1)	(96.1)
Stockholders' Equity [Roll Forward]
Net (loss) income	(236.6)			(236.6)
Other comprehensive income, net of tax	64.4					64.4
Issuance of non-vested shares to employees		62,285
Issuance of common shares to directors, shares		2,436
Issuance of common shares to non-employee directors	0.2		0.2
Issuance of common shares to employees upon vesting of restricted stock units and performance shares		52,106
Cancellation of employee non-vested shares		(987)
Cancellation of shares to cover employees’ tax withholdings upon vesting of non-vested shares, shares		(37,009)
Cancellation of shares to cover employees’ tax withholdings upon vesting of non-vested shares	$ (2.8)		(2.8)
Repurchase of common stock, shares	(647,520)	(647,520)
Repurchase of common stock	$ (49.4)				(49.4)
Stock Issued During Period, Shares, Other		1,015,185
Cash dividends on common stock	(28.1)			(28.1)
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest	1.3		1.3
Amortization of unearned equity compensation	9.3		9.3
Restricted Stock Award, Forfeitures, Dividends	$ 0.2			0.2
Ending balance, shares at Dec. 31, 2015	18,053,747	18,053,747
Ending balance at Dec. 31, 2015	$ 774.4	$ 0.2	$ 1,036.5	$ 15.9	$ (246.5)	$ (31.7)