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Restructuring - Restructuring Charges (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Restructuring Cost and Reserve [Line Items]        
Total restructuring charges $ 12.7 $ 0.3 $ 21.7 $ 1.0
Severance and related costs        
Restructuring Cost and Reserve [Line Items]        
Total restructuring charges 7.7 0.3 16.7 1.0
Severance and related costs | Gas Cylinders        
Restructuring Cost and Reserve [Line Items]        
Total restructuring charges 7.7 (0.1) 16.6 0.1
Severance and related costs | Elektron        
Restructuring Cost and Reserve [Line Items]        
Total restructuring charges 0.0 0.4 0.1 0.9
Asset impairments        
Restructuring Cost and Reserve [Line Items]        
Total restructuring charges 5.0 0.0 5.0 0.0
Asset impairments | Gas Cylinders        
Restructuring Cost and Reserve [Line Items]        
Total restructuring charges 0.6 0.0 0.6 0.0
Asset impairments | Elektron        
Restructuring Cost and Reserve [Line Items]        
Total restructuring charges $ 4.4 $ 0.0 $ 4.4 $ 0.0