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Non-operating Income (Expense) (Tables) | 12 Months Ended
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Dec. 31, 2014
Nonoperating Income (Expense) [Abstract] |
Schedule of Other Nonoperating Income (Expense) [Table Text Block] |
| Year ended December 31,
Dollar amounts in millions | 2014 |  | 2013 |  | 2012
Interest expense | $ | (29.9 | ) |  | $ | (36.2 | ) |  | $ | (48.0 | )
Amortization of debt charges | (1.2 | ) |  | (1.4 | ) |  | (1.5 | )
Capitalized interest | 1.3 |  |  | 1.6 |  |  | 0.2 |
Interest expense, net of capitalized interest | (29.8 | ) |  | (36.0 | ) |  | (49.3 | )
Investment income | 5.5 |  |  | 9.4 |  |  | 13.0 |
SERP market adjustments | — |  |  | 0.9 |  |  | 1.8 |
Investment income | 5.5 |  |  | 10.3 |  |  | 14.8 |
Foreign currency losses | (3.1 | ) |  | (5.3 | ) |  | (2.7 | )
Gain on settlement of litigation related to ARS | — |  |  | — |  |  | 20.0 |
Gain on acquisition | — |  |  | 35.9 |  |  | — |
Gain on the sale of joint venture | — |  |  | 1.2 |  |  | — |
Early debt extinguishment | — |  |  | (2.3 | ) |  | (52.2 | )
Other non-operating income (expense) | (3.1 | ) |  | 29.5 |  |  | (34.9 | )
Total non-operating income (expense) | $ | (27.4 | ) |  | $ | 3.8 |  |  | $ | (69.4 | )

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- Definition Tabular disclosure of the components of non-operating income or non-operating expense that may include amounts earned from dividends, interest on securities, gains (losses) on securities sold, equity earnings of unconsolidated affiliates, net gain (loss) on sales of business, interest expense and other miscellaneous income or expense items. + References No definition available. + Details
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