Non-operating Income (Expense) (Tables)

12 Months Ended

Dec. 31, 2011

Nonoperating Income (Expense) [Abstract]

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

	Year ended December 31,
Dollar amounts in millions	2011			2010			2009
Interest expense	$	(54.4	)	$	(60.8	)	$	(71.7	)
Amortization of debt charges	(2.6		)	(3.1		)	(3.0		)
Capitalized interest	0.1			—			0.1
Interest expense, net of capitalized interest	(56.9		)	(63.9		)	(74.6		)
Investment income	13.3			18.0			26.0
Realized gains from the sales of investments	15.2			19.0			18.7
SERP market adjustments	0.2			1.4			3.0
Investment income	28.7			38.4			47.7
Other than temporary impairment	(14.8		)	(17.0		)	(2.0		)
Foreign currency gains (losses)	(1.0		)	2.2			13.4
Early debt extinguishment	—			—			(20.7		)
Other non-operating expense	(1.0		)	2.2			(7.3		)
Total non-operating income (expense)	$	(44.0	)	$	(40.3	)	$	(36.2	)