Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Accounting Policies [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

Components of accumulated other comprehensive loss were as follows ($ in millions):

	December 31,
	2012			2011
Accumulated pension and OPEB liability adjustments, net of income tax of $23.3 million and $24.8 million at December 31, 2012 and 2011, respectively	$	(43.2	)	$	(44.2	)
Accumulated unrealized gain (loss) on financial instruments, net of income tax benefit of $1.5 million and $0.6 million at December 31, 2012 and 2011, respectively	(1.4		)	0.4
Accumulated unrealized foreign currency translation adjustments	29.2			19.3
Accumulated other comprehensive loss	$	(15.4	)	$	(24.5	)

Schedule of Comprehensive Income (Loss)

Changes in the components of accumulated other comprehensive loss were as follows ($ in millions):

	For the Years Ended December 31,
	2012									2011									2010
	Pre-tax			Tax			Net of Tax			Pre-tax			Tax			Net of Tax			Pre-tax			Tax		Net of Tax
Pension and OPEB liability adjustments	$	2.5		$	(1.5	)	$	1.0		$	(2.0	)	$	(0.5	)	$	(2.5	)	$	(8.8	)	$	3.9	$	(4.9	)
Unrealized (loss) gain on derivative instruments	(2.7		)	0.9			(1.8		)	(7.5		)	2.6			(4.9		)	(0.9		)	0.4		(0.5		)
Unrealized foreign currency translation adjustments	9.9			—			9.9			(18.6		)	—			(18.6		)	0.2			—		0.2
Total	$	9.7		$	(0.6	)	$	9.1		$	(28.1	)	$	2.1		$	(26.0	)	$	(9.5	)	$	4.3	$	(5.2	)