Non-operating Income (Expense) (Tables)

12 Months Ended

Dec. 31, 2012

Nonoperating Income (Expense) [Abstract]

Schedule of Other Nonoperating Income (Expense) [Table Text Block]

	Year ended December 31,
Dollar amounts in millions	2012			2011			2010
Interest expense	$	(48.0	)	$	(54.4	)	$	(60.8	)
Amortization of debt charges	(1.5		)	(2.6		)	(3.1		)
Capitalized interest	0.2			0.1			—
Interest expense, net of capitalized interest	(49.3		)	(56.9		)	(63.9		)
Investment income	13.0			13.3			18.0
Realized gains from the sales of investments	—			15.2			19.0
SERP market adjustments	1.8			0.2			1.4
Investment income	14.8			28.7			38.4
Other than temporary impairment	—			(14.8		)	(17.0		)
Foreign currency gains (losses)	(2.7		)	(1.0		)	2.2
Gain on settlement of litigation related to ARS	20.0			—			—
Early debt extinguishment	(52.2		)	—			—
Other non-operating expense	(34.9		)	(1.0		)	2.2
Total non-operating expense	$	(69.4	)	$	(44.0	)	$	(40.3	)