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Non-operating Income (Expense) (Notes) | 12 Months Ended
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Dec. 31, 2018
Nonoperating Income (Expense) [Abstract] |
Other Income and Other Expense Disclosure [Text Block] | NON-OPERATING INCOME (EXPENSE) Included in our Consolidated Statements of Income is non-operating expense of $2.1 million, $22.6 million and $45.3 million for the years ended December 31, 2018, 2017 and 2016. This income (expense) is comprised of the following components:
| 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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- Definition The entire disclosure for other income or other expense items (both operating and nonoperating). Sources of nonoperating income or nonoperating expense that may be disclosed, include amounts earned from dividends, interest on securities, profits (losses) on securities, net and miscellaneous other income or income deductions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -URI http://asc.fasb.org/topic&trid=2122503 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 610 -URI http://asc.fasb.org/topic&trid=49130413 + Details
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