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LEASES (Tables)
12 Months Ended
Dec. 31, 2013
Leases [Abstract]  
Schedule of future minimum rental obligations under noncancelable operating leases
Future minimum rental obligations under noncancelable operating leases are payable as follows:
Year ending December 31
(Millions)
 
Payments
2014
 
$
6.7

2015
 
6.4

2016
 
6.4

2017
 
7.4

2018
 
7.3

Later years
 
59.4

Total
 
$
93.6