Annual report pursuant to Section 13 and 15(d)

RELATED PARTY TRANSACTIONS Narrative (Details)

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RELATED PARTY TRANSACTIONS Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Apr. 01, 2019
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jul. 31, 2011
Related Party Transaction [Line Items]          
Proceeds from divestiture of businesses $ 38.0        
Gain (loss) on disposition of business $ 10.9        
Corporate Joint Venture          
Related Party Transaction [Line Items]          
Purchases from related party   $ 0.6 $ 2.0 $ 2.0  
Training Services | Equity Method Investee          
Related Party Transaction [Line Items]          
Notes receivable to related party     3.7    
Dart Holding Company Ltd.          
Related Party Transaction [Line Items]          
Expenses from transactions with related party     27.1 2.0  
Dart Holding Company Ltd. | Equity Method Investee          
Related Party Transaction [Line Items]          
Notes receivable to related party     2.3   $ 5.1
Era Training Center | Helicopter, Management and Other Services | Equity Method Investee          
Related Party Transaction [Line Items]          
Expenses from transactions with related party     0.1 0.2  
Era Training Center | Training Services | Equity Method Investee          
Related Party Transaction [Line Items]          
Expenses from transactions with related party     $ 0.2 $ 0.5