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Self-Insurance (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Self Insurance Reserves [Abstract] |  |
Self insurance reserve | $ 165.0 | $ 184.0
Self insurance reserves, noncurrent | 101.7 | 112.9
Accrual receivable | 17.5 | 22.8
Accrued reserves decreased facility operating expense | 9.9 | 35.4
Cash deposits for self insured retention risk | 12.7 | 12.4
Letters of credit associated to the secured self-insured retention risk | 71.8 | 59.5
Cash deposit to collateralize the insurance policy | $ 33.9 | $ 37.4

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- Definition The total amount of cash and letters of credit associated to the secured self-insured retention risk. + References No definition available. + Details
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- Definition Cash deposit to collateralize the insurance policy + References No definition available. + Details
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- Definition Self Insurance Reserves [Abstract] + References No definition available. + Details
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- Definition Self- Insurance Reserves, Cash Deposits For Self Insured Retention Risk + References No definition available. + Details
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- Definition Amount of increase (decrease) in liability to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Amount of receivable related to a loss contingency accrual. For example, an insurance recovery receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12053-110248 + Details
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- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property that are expected to be paid after one year (or the normal operating cycle, if longer). + References No definition available. + Details
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