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Contractual Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2013
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Accruals For Environmental Remediation, Dismantling, and Decontamination
 
 
March 31, 2013
 
December 31, 2012
(in millions)
 
Former TEL
Plant Site,
Louisiana
 
Houston,
Texas Plant
Site
 
Superfund
Site,
Louisiana
 
Former TEL
Plant Site,
Louisiana
 
Houston,
Texas Plant
Site
 
Superfund
Site,
Louisiana
Accrual, discounted
 
$
5.5

 
$
6.0

 
$
3.2

 
$
5.6

 
$
6.1

 
$
3.2

Accrual, undiscounted
 
6.8

 
9.1

 
4.4

 
6.9

 
9.3

 
4.4

Discount rate for accrual
 
3
%
 
3
%
 
3
%
 
3
%
 
3
%
 
3
%
Expected future payments:
 
 
 
 
 
 
 
 
 
 
 
 
2013
 
$
0.6

 
$
0.7

 
$
0.0

 
 
 
 
 
 
2014
 
0.8

 
0.2

 
0.0

 
 
 
 
 
 
2015
 
0.6

 
0.2

 
0.2

 
 
 
 
 
 
2016
 
0.5

 
0.2

 
0.3

 
 
 
 
 
 
2017
 
0.6

 
0.2

 
0.3

 
 
 
 
 
 
Thereafter
 
3.7

 
7.6

 
3.6