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Acquisitions - Additional Information (Q3) (Details)
3 Months Ended 4 Months Ended 9 Months Ended 12 Months Ended
Mar. 21, 2017
USD ($)
Mar. 06, 2017
USD ($)
Feb. 03, 2017
USD ($)
Nov. 30, 2016
USD ($)
Country
Employee
Mar. 31, 2017
USD ($)
Mar. 21, 2017
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Mar. 22, 2018
USD ($)
Dec. 04, 2017
USD ($)
Oct. 02, 2017
USD ($)
Apr. 05, 2017
USD ($)
Mar. 14, 2017
USD ($)
Mar. 13, 2017
USD ($)
Nov. 30, 2016
€ / shares
Business Acquisition [Line Items]                                  
Cash payment for acquisition               $ 1,006,207,000 $ 904,695,000 $ 135,231,000              
Equity issued in acquisition               25,500,000 534,679,000 $ 0              
Escrow deposits               0 744,748,000                
Acquisition of noncontrolling interest                 760,599,000                
Additions             $ 18,959,000                    
Goodwill             2,412,554,000 2,460,103,000 2,078,765,000                
Customer Relationships                                  
Business Acquisition [Line Items]                                  
Acquired indefinite-lived intangible assets             $ 67,600,000                    
Intangible assets, weighted average useful life (years)             20 years                    
Trade Names                                  
Business Acquisition [Line Items]                                  
Acquired indefinite-lived intangible assets             $ 31,900,000                    
Faiveley Transport                                  
Business Acquisition [Line Items]                                  
Annual sales of Faiveley       $ 1,200,000,000                          
Number of employees (more than) | Employee       5,700                          
Number of countries Faiveley operates in | Country       24                          
Purchase price per share (in euros per share) | € / shares                                 € 100
Outstanding share capital acquired (as a percent)       51.00%                          
Percentage of voting interests in Faiveley (as a percent) 100.00% 22.00% 27.00% 49.00%   100.00%                      
Share conversion ratio       1.1538                          
Additional share capital acquired (as a percent)   21.00% 27.00%                            
Cash payment for acquisition $ 17,500,000 $ 303,200,000 $ 411,800,000                            
Equity issued in acquisition   $ 300,000 $ 25,200,000                            
Cumulative share capital acquired (as a percent) 100.00% 99.00% 78.00%     100.00%                      
Cumulative voting rights acquired (as a percent) 100.00% 98.00% 76.00% 100.00%   100.00%                      
Business combination, consideration transferred       $ 1,507,000,000   $ 1,507,000,000                      
Escrow deposits                 744,700,000                
Acquisition of noncontrolling interest         $ 8,900,000                        
Adjustment to current liabilities acquired               65,300,000                  
Accounts receivable $ 439,631,000     439,631,000   439,631,000                      
Current liabilities 819,493,000     819,493,000   819,493,000                      
Adjustment to other noncurrent assets               30,000,000                  
Additions               74,100,000                  
Accrued share based compensation acquired in acquisition       25,900,000     25,900,000                    
Goodwill 1,262,350,000     $ 1,262,350,000   1,262,350,000                      
Faiveley Transport | Customer Relationships                                  
Business Acquisition [Line Items]                                  
Adjustment to customer relationships acquired               21,800,000                  
Faiveley Transport | Restatement Adjustment | Fair Value of Receivables                                  
Business Acquisition [Line Items]                                  
Accounts receivable               2,800,000                  
Faiveley Transport | Restatement Adjustment | Fair Value of Current Liabilities                                  
Business Acquisition [Line Items]                                  
Current liabilities               36,200,000                  
Faiveley Transport | Restatement Adjustment | Fair Value of Assets Acquired and Liabilities Assumed                                  
Business Acquisition [Line Items]                                  
Accounts receivable               64,300,000                  
Current liabilities         $ 64,300,000     64,300,000                  
Faiveley Transport | Minimum                                  
Business Acquisition [Line Items]                                  
Percentage of business acquisition consideration payable in cash (as a percent)       25.00%                          
Faiveley Transport | Maximum                                  
Business Acquisition [Line Items]                                  
Percentage of business acquisition consideration payable in cash (as a percent)       45.00%                          
Acquisitions other than Faiveley                                  
Business Acquisition [Line Items]                                  
Escrow deposits             30,200,000 44,400,000                  
Other intangible assets             103,900,000                    
TTC                                  
Business Acquisition [Line Items]                                  
Purchase price, net of cash acquired                           $ 32,511,000      
Goodwill                           14,095,000      
Goodwill tax deduction                           14,100,000      
Other intangible assets                           $ 12,300,000      
ATP                                  
Business Acquisition [Line Items]                                  
Purchase price, net of cash acquired                               $ 65,254,000  
Goodwill                               29,034,000  
Goodwill tax deduction                             $ 31,900,000 29,000,000  
Other intangible assets                               $ 25,000,000  
Melett                                  
Business Acquisition [Line Items]                                  
Purchase price, net of cash acquired                       $ 71,893,000          
Goodwill                       25,732,000          
Goodwill tax deduction                       0          
Other intangible assets                       $ 30,479,000          
Annax                                  
Business Acquisition [Line Items]                                  
Purchase price, net of cash acquired                     $ 28,664,000            
Goodwill                     14,301,000            
Goodwill tax deduction                     0            
Other intangible assets                     $ 23,998,000            
AM General                                  
Business Acquisition [Line Items]                                  
Purchase price, net of cash acquired                         $ 10,416,000        
Goodwill                         12,944,000        
Goodwill tax deduction                         0        
Other intangible assets                         $ 12,097,000        
Freight Segment                                  
Business Acquisition [Line Items]                                  
Additions             5,252,000                    
Goodwill             716,500,000 718,958,000 550,902,000                
Freight Segment | Faiveley Transport                                  
Business Acquisition [Line Items]                                  
Goodwill 72,000,000     $ 72,000,000   72,000,000                      
Transit Segment                                  
Business Acquisition [Line Items]                                  
Additions             13,707,000                    
Goodwill             $ 1,696,054,000 $ 1,741,145,000 $ 1,527,863,000                
Transit Segment | Faiveley Transport                                  
Business Acquisition [Line Items]                                  
Goodwill $ 1,190,400,000     $ 1,190,400,000   $ 1,190,400,000