GUARANTEES (Details) $ in Millions	Jun. 30, 2019 USD ($)
Guarantees
Total guarantees	$ 128.1
Guarantees expiring in less than 1 year	17.3
Guarantees expiring within 1 to 3 years	1.2
Guarantees with expiration over 3 years	109.6
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	101.3
Guarantees expiring in less than 1 year	1.0
Guarantees expiring within 1 to 3 years	0.2
Guarantees with expiration over 3 years	100.1
Surety bonds
Guarantees
Total guarantees	9.7
Guarantees expiring in less than 1 year	9.6
Guarantees expiring within 1 to 3 years	0.1
Guarantees with expiration over 3 years	0.0
Other guarantees
Guarantees
Total guarantees	10.4
Guarantees expiring in less than 1 year	0.0
Guarantees expiring within 1 to 3 years	0.9
Guarantees with expiration over 3 years	9.5
Other indemnifications
Guarantees
Total guarantees	10.4
Liability related to workers compensation coverage	9.5
Bluewater | Guarantees supporting commodity transactions of subsidiaries
Guarantees
Total guarantees	2.7
UMERC | Guarantees supporting commodity transactions of subsidiaries
Guarantees
Total guarantees	$ 4.0