LONG-TERM DEBT (Tables)

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Schedule of all principal debt payment amounts related to bond maturities

A schedule of all principal debt payment amounts related to bond maturities, excluding those associated with long-term debt to parent, is as follows:

(Millions)	Payments
2015	$	125.0
2016	—
2017	125.0
2018	—
2019	—
Later years	925.1
Total	$	1,175.1