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Income taxes: (Tables)
 3 Months Ended
Mar. 31, 2013
Income Tax Disclosure [Abstract]  
Component of Income Taxes
     Three months ended
March  31,		  
     2012     2013  
     (In millions)  

Expected tax provision (benefit) at U.S. federal statutory income tax rate of 35%

    $ 10.0      $ (5.2 ) 

Incremental U.S. tax and rate differences on equity in earnings

      (1.9 )      (7.4 ) 

Other, net

      (.1 )      (.1 ) 
  

 

 

    

 

 

  

Total

    $ 8.0      $ (12.7 ) 
  

 

 

    

 

 

  
Components of Comprehensive Provision for Income Taxes Allocation
     Three months ended
March  31,		  
     2012     2013  
     (In millions)  

Comprehensive provision (benefit) for income taxes allocable to:

     

Continuing operations

    $ 8.0      $ (12.7 ) 

Discontinued operations

      .6        —     

Other comprehensive income (loss):

     

Marketable securities

      (13.9 )      18.3   

Currency translation

      2.0        (2.9 ) 

Pension plans

      .3        .4   

OPEB plans

      (.1 )      (.1 ) 
  

 

 

    

 

 

  

Total

    $ (3.1 )    $ 3.0