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Business Combinations - Hudson Intangible Assets Acquired (Details) - USD ($)
$ in Millions
6 Months Ended
Sep. 20, 2017
Jun. 30, 2018
Acquired Finite-Lived Intangible Assets    
Weighted-average Estimated Useful Life   16 years
Customer relationships    
Acquired Finite-Lived Intangible Assets    
Weighted-average Estimated Useful Life   14 years
Unpatented technology    
Acquired Finite-Lived Intangible Assets    
Weighted-average Estimated Useful Life   12 years
Hudson    
Acquired Finite-Lived Intangible Assets    
Weighted-average Estimated Useful Life 12 years  
Finite lived intangible assets acquired $ 141.7  
Identifiable intangible assets 211.0  
Hudson | Trademarks and trade names    
Acquired Finite-Lived Intangible Assets    
Indefinite-lived intangible assets acquired $ 69.3  
Hudson | Customer relationships    
Acquired Finite-Lived Intangible Assets    
Weighted-average Estimated Useful Life 13 years  
Finite lived intangible assets acquired $ 122.1  
Hudson | Unpatented technology    
Acquired Finite-Lived Intangible Assets    
Weighted-average Estimated Useful Life 10 years  
Finite lived intangible assets acquired $ 18.3  
Hudson | Customer backlog    
Acquired Finite-Lived Intangible Assets    
Weighted-average Estimated Useful Life 2 years  
Finite lived intangible assets acquired $ 1.3