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Schedule II Valuation and Qualifying Accounts and Reserves (in millions): (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Accounts Receivable:
      
Reserve deducted in balance sheet to which applicable:      
Balance at beginning of period   $ 4.6 $ 4.8
Deduction/Application   4.6 0.2
Balance at end of period     4.6
Notes issued under par:
      
Reserve deducted in balance sheet to which applicable:      
Balance at beginning of period 25.9 16.1 16.4
Charged to costs and expenses 0.5 0.5 0.3
Additions   10.3  
Balance at end of period 25.4 25.9 16.1
Deferred Tax Assets:
      
Reserve deducted in balance sheet to which applicable:      
Balance at beginning of period 30.0 30.5 28.6
Charged to costs and expenses     2.2
Deduction/Application 30.0 0.5 0.3
Balance at end of period   $ 30.0 $ 30.5