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Accounting Policies - Accumulated Other Comprehensive Loss by Component, Net of Tax (Q3) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  |  | $ 2,808,868 | $ 2,205,977 | $ 2,205,977 |  |
Other comprehensive income (loss) before reclassifications |  |  | (166,613) | 284,693 |  |  |
Amounts reclassified from accumulated other comprehensive income |  |  | 5,872 | 2,982 |  |  |
Other comprehensive (loss) income, net of tax | $ (49,532) | $ 92,620 | (160,741) | 287,675 | 334,613 | $ (102,886) | $ (117,233)
Ending balance | 2,895,170 |  | 2,895,170 |  | 2,808,868 | 2,205,977 |
Foreign currency translation |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  |  | 5,063 | (321,033) | (321,033) |  |
Other comprehensive income (loss) before reclassifications |  |  | (159,064) | 277,984 |  |  |
Amounts reclassified from accumulated other comprehensive income |  |  | 0 | 0 |  |  |
Other comprehensive (loss) income, net of tax |  |  | (159,064) | 277,984 |  |  |
Ending balance | (154,001) | (43,049) | (154,001) | (43,049) | 5,063 | (321,033) |
Derivative contracts |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  |  | 4,015 | (2,957) | (2,957) |  |
Other comprehensive income (loss) before reclassifications |  |  | (8,544) | 11,424 |  |  |
Amounts reclassified from accumulated other comprehensive income |  |  | 4,314 | 1,206 |  |  |
Other comprehensive (loss) income, net of tax |  |  | (4,230) | 12,630 |  |  |
Ending balance | (215) | 9,673 | (215) | 9,673 | 4,015 | (2,957) |
Pension and post retirement benefit plans |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  |  | (54,070) | (55,615) | (55,615) |  |
Other comprehensive income (loss) before reclassifications |  |  | 995 | (4,715) |  |  |
Amounts reclassified from accumulated other comprehensive income |  |  | 1,558 | 1,776 |  |  |
Other comprehensive (loss) income, net of tax |  |  | 2,553 | (2,939) |  |  |
Ending balance | (51,517) | (58,554) | (51,517) | (58,554) | (54,070) | (55,615) |
AOCI Attributable to Parent |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  |  | (44,992) | (379,605) | (379,605) |  |
Ending balance | $ (205,733) | $ (91,930) | $ (205,733) | $ (91,930) | $ (44,992) | $ (379,605) |

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