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Write-downs, Reserves, and Project Opening Costs, net of Recoveries (Tables)
 9 Months Ended
Sep. 30, 2013
Disclosure Writedowns Reserves And Project Opening Costs Net Of Recoveries Components Of Write Downs Reserves And Project Opening Costs Net Of Recoveries [Abstract]  
Components of Write-Downs, Reserves, and Project Opening Costs, Net of Recoveries
The components of write-downs, reserves, and project opening costs, net of recoveries are as follows:
 
Quarter Ended September 30,
 
Nine Months Ended September 30,
(In millions)
2013

2012
 
2013
 
2012
Remediation costs
$
5.4

 
$
6.4

 
$
24.4

 
$
12.4

Divestitures and abandonments
2.4

 
28.1

 
16.3

 
36.2

Project opening costs
7.0

 
2.8

 
11.6

 
4.7

Other
(14.3
)
 
(4.5
)
 
(7.6
)
 
3.6

Total write-downs, reserves, and project opening costs, net of recoveries
$
0.5

 
$
32.8

 
$
44.7

 
$
56.9