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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)