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Schedule II Valuation and Qualifying Accounts (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Valuation and qualifying accounts [Roll Forward]      
Balance at beginning of period $ 25.4 $ 25.0 $ 24.1
Charged to costs and expenses (0.3) 0.6 0.2
Deductions (5.5) (0.2) 0.7
Balance at end of period 19.6 25.4 25.0
Deferred Tax Asset Valuation Allowance [Member]
     
Valuation and qualifying accounts [Roll Forward]      
Balance at beginning of period 24.9 24.3 23.4
Charged to costs and expenses (0.2) 0.8 0.4
Deductions (5.4) (0.2) 0.5
Balance at end of period 19.3 24.9 24.3
Allowance for Doubtful Accounts Receivable [Member]
     
Valuation and qualifying accounts [Roll Forward]      
Balance at beginning of period 0.5 0.7 0.7
Charged to costs and expenses (0.1) (0.2) (0.2)
Deductions (0.1)   0.2
Balance at end of period $ 0.3 $ 0.5 $ 0.7