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Commitments and Contingencies - Asbestos Narrative (Details)
$ in Millions
6 Months Ended 318 Months Ended
Jun. 30, 2017
claimants
cases
Jun. 30, 2017
USD ($)
claimants
cases
Dec. 31, 2016
claimants
Dec. 31, 2015
claimants
Maximum [Member]        
Loss Contingencies [Line Items]        
Estimated Time until Primary Insurance is Exhausted 12 months      
Asbestos [Member]        
Loss Contingencies [Line Items]        
Loss Contingency, Pending Claims, Number     5,339 6,242
Total settlement costs | $   $ 8.4    
Percentage of settlement and defense costs covered by insurance   40.00%    
Asbestos [Member] | Pending Litigation [Member]        
Loss Contingencies [Line Items]        
Loss Contingency, Pending Claims, Number | cases 609 609    
Number of pending claims 5,274      
Punitive Only Damages [Member] | Asbestos [Member] | Pending Litigation [Member]        
Loss Contingencies [Line Items]        
Number of pending claims seeking specific amounts of damages 0 0    
Compensatory Only Damages [Member] | Asbestos [Member] | Pending Litigation [Member]        
Loss Contingencies [Line Items]        
Number of pending claims seeking specific amounts of damages 58 58