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Notes Receivable from Asset Sales (Tables)
 12 Months Ended
Dec. 31, 2012
Notes Receivable From Asset Sales [Abstract]  
Notes receivable from asset sales [Table Text Block]
Dollar amounts in millions
Interest  Rate
2012
December 31,
2012
 
2011
Notes receivable (unsecured), matured 2012, interest rates fixed
5.6
%
$
—

 
$
9.9

Notes receivable (secured), maturing 2013-2018, interest rates fixed
7.1 – 7.3%

113.6

 
113.6

Notes receivable (secured), maturing 2018, interest rate variable
 
410.0

 
410.0

Total
 
523.6

 
533.5

Current portion
 
91.4

 
10.0

Long-term portion
 
$
432.2

 
$
523.5
Schedule Of Notes Receivable Maturity Dates [Table Text Block]
The weighted average interest rate for all notes receivable from asset sales at December 31, 2012 and 2011 was approximately 2.0% and 2.1%. The notes mature as follows:
 
Dollar amounts in millions
 
Year ended December 31,
 
2013
$
91.4

2014
—

2015
—

2016
—

2017
—

2018 and after
432.2

Total
$
523.6