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Insurance (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Insurance reserves - current portion | $ 429.7 | $ 414.5
Insurance reserves - long-term portion | 174.3 | 157.1
Insurance reserves [Member] |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Insurance reserves - current portion | 24.1 | 22.6
Insurance reserves - long-term portion | 42.2 | 38.9
Total insurance reserves | $ 66.3 | $ 61.5

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