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Use Of Estimates (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Accrued Expenses |  |  |
Employee benefits | $ 187.9 | $ 181.3 |
Unearned revenue | 476.4 | 481.7 |
Warranty | 50.5 | 46.2 | 38.9
Other | 281.8 | 268.1 |
Total | 996.6 | 977.3 |
Analysis of product warranty accrual |  |  |
Balance at beginning of period | 56.3 | 47.4 | 49.0
Acquisitions | 3.7 | 7.7 | 1.7
Provisions | 25.3 | 21.5 | 20.3
Usage | (24.7) | (20.3) | (23.6)
Balance at end of period | 60.6 | 56.3 | 47.4
Less: Current portion of warranty | 50.5 | 46.2 | 38.9
Non-current portion of warranty | 10.1 | 10.1 | 8.5
Allowance for Doubtful Accounts |  |  |
Accounts Receivable Allowances |  |  |
Balance at beginning of year | 41.3 | 44.3 | 44.6
Acquisitions | 2.8 | 1.2 | 1.1
Allowances provided | 28.0 | 17.8 | 18.9
Write-offs, net of recoveries and credits issued | (21.5) | (22.0) | (20.3)
Balance at end of year | $ 50.6 | $ 41.3 | $ 44.3

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- Definition Represents cash or payments received from a customer in advance of services that have not yet been performed. Examples of unearned revenue include billings received in excess of costs and estimated earnings on uncompleted contracts accounted for under the percentage-of-completion method of revenue recognition, customer deposits and unearned amounts on service contracts. + References No definition available. + Details
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