GUARANTEES (Details) $ in Millions	Sep. 30, 2019 USD ($)
Guarantees
Total guarantees	$ 131.9
Guarantees expiring in less than 1 year	17.6
Guarantees expiring within 1 to 3 years	1.4
Guarantees with expiration over 3 years	112.9
Guarantees supporting commodity transactions of subsidiaries
Guarantees
Total guarantees	6.7
Guarantees expiring in less than 1 year	6.7
Guarantees expiring within 1 to 3 years	0.0
Guarantees with expiration over 3 years	0.0
Standby letters of credit
Guarantees
Total guarantees	103.1
Guarantees expiring in less than 1 year	1.0
Guarantees expiring within 1 to 3 years	0.5
Guarantees with expiration over 3 years	101.6
Surety bonds
Guarantees
Total guarantees	9.9
Guarantees expiring in less than 1 year	9.9
Guarantees expiring within 1 to 3 years	0.0
Guarantees with expiration over 3 years	0.0
Other guarantees
Guarantees
Total guarantees	12.2
Guarantees expiring in less than 1 year	0.0
Guarantees expiring within 1 to 3 years	0.9
Guarantees with expiration over 3 years	11.3
Other indemnifications
Guarantees
Total guarantees	12.2
Liability related to workers compensation coverage	11.3
Bluewater | Guarantees supporting commodity transactions of subsidiaries
Guarantees
Total guarantees	2.7
UMERC | Guarantees supporting commodity transactions of subsidiaries
Guarantees
Total guarantees	$ 4.0