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Guarantees (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Guarantor Obligations  
Total guarantees $ 119.3
Guarantees expiring in less than one year 29.1
Guarantees expiring within one to three years 1.2
Guarantees with expiration over three years 89.0
Guarantees supporting commodity transactions of subsidiaries  
Guarantor Obligations  
Total guarantees 5.6
Guarantees expiring in less than one year 5.6
Guarantees expiring within one to three years 0.0
Guarantees with expiration over three years 0.0
Guarantees supporting commodity transactions of subsidiaries | Bluewater  
Guarantor Obligations  
Total guarantees 5.6
Standby letters of credit  
Guarantor Obligations  
Total guarantees 92.6
Guarantees expiring in less than one year 13.9
Guarantees expiring within one to three years 0.2
Guarantees with expiration over three years 78.5
Surety bonds  
Guarantor Obligations  
Total guarantees 9.2
Guarantees expiring in less than one year 9.1
Guarantees expiring within one to three years 0.1
Guarantees with expiration over three years 0.0
Other guarantees  
Guarantor Obligations  
Total guarantees 11.9
Guarantees expiring in less than one year 0.5
Guarantees expiring within one to three years 0.9
Guarantees with expiration over three years 10.5
Other indemnification  
Guarantor Obligations  
Total guarantees 11.9
Liability related to workers compensation coverage $ 10.5