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Non-operating Income (Expense) (Tables) | 12 Months Ended
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Dec. 31, 2018
Nonoperating Income (Expense) [Abstract] |
Schedule of Other Nonoperating Income (Expense) [Table Text Block] |
| Year ended December 31,
Dollar amounts in millions | 2018 |  | 2017 |  | 2016
Interest expense | $ | (19.0 | ) |  | $ | (20.6 | ) |  | $ | (32.9 | )
Amortization of debt charges | (0.8 | ) |  | (0.9 | ) |  | (1.1 | )
Capitalized interest | 4.0 |  |  | 2.2 |  |  | 1.9 |
Interest expense, net of capitalized interest | (15.8 | ) |  | (19.3 | ) |  | (32.1 | )
Interest income | 18.1 |  |  | 9.5 |  |  | 8.0 |
Gain on securities | 0.4 |  |  | — |  |  | — |
SERP market adjustments | (0.9 | ) |  | 1.0 |  |  | 0.2 |
Investment income | 17.6 |  |  | 10.5 |  |  | 8.2 |
Net periodic pension cost, excluding service cost | (4.3 | ) |  | (9.4 | ) |  | (6.2 | )
Foreign currency losses | 0.4 |  |  | (4.4 | ) |  | 2.1 |
Early debt extinguishment | — |  |  | — |  |  | (17.3 | )
Other non-operating income (expense) | (3.9 | ) |  | (13.8 | ) |  | (21.4 | )
Total non-operating income (expense) | $ | (2.1 | ) |  | $ | (22.6 | ) |  | $ | (45.3 | )

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- References No definition available. + Details
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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
Name: | us-gaap_ScheduleOfOtherNonoperatingIncomeExpenseTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration