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Insurance (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Valuation and Qualifying Accounts Disclosure [Line Items]
Insurance reserves - current portion	$ 395.9	$ 348.8
Insurance reserves - long-term portion	157.1	144.9
Insurance reserves [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Insurance reserves - current portion	22.6	23.6
Insurance reserves - long-term portion	38.9	34.6
Total insurance reserves	$ 61.5	$ 58.2

Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.

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