Annual report pursuant to Section 13 and 15(d)

Accounting Policies Revenue Recognition and Accounts Receivable and Allowance (Details)

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Accounting Policies Revenue Recognition and Accounts Receivable and Allowance (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Accounting Policies [Abstract]      
Operating Lease Term, Average, Minimum 3 years    
Operating Lease Term, Average, Maximum 5 years    
Allowance for Doubtful Accounts Receivable $ 3.9 $ 3.4 $ 5.1
Write-offs of Accounts Receivable 2.4 1.2 3.8
Notes, Loans and Financing Receivable, Net $ 7.3 $ 8.1