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Debt (Tables)
12 Months Ended
Dec. 31, 2012
Debt  
Schedule of Credit Facility
December 31,
2012
2011
(millions)
Borrowings under the revolving credit facility
$ - $ -
Term loan due May 31, 2013
83.2 -
Term loan due May 31, 2012
- 85.0
Letters of credit
14.7 19.6
Available credit
87.1 205.4