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Significant Accounting Policies (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Significant Accounting Policies [Line Items] |  |  |
Allocated Share-based Compensation Expense | $ 22.7 | $ 16.2 | $ (2.5)
Depreciation expenses including capital leases | 205,600,000 | 189,600,000 | 164,800,000
Self-insurance reserve | 127,600,000 | 125,800,000 |
Long-term portions of self insurance reserve | 77,700,000 | 78,400,000 |
Advertising expense | 27,300,000 | 20,500,000 | 22,900,000
Debt and Capital Lease Obligations | 95,000,000 | 104,975,000 |
Long-term Debt, Fair Value | 97,100,000 | 108,300,000 |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense | (9.0) | $ (6.3) | $ (1.0)
Group Health Claims [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Insurance maximum, per occurrence | 1,000,000 |  |
Workers Compensation Claims [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Insurance maximum, per occurrence | 1,000,000 |  |
Cargo Loss And Damage Claims [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Insurance maximum, per occurrence | 100,000 |  |
Bodily Injury And Property Damage [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Insurance maximum, per occurrence | 2,750,000 |  |
Corridor Deductible | 2,500,000 |  |
Insurance Layer to Meet Corridor Deductible | 5,000,000 |  |
2016 Share Repurchase Program [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Stock Repurchase Program, Authorized Amount | 250,000,000 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | 192,000,000 |  |
2014 Share Repurchase Program [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Stock Repurchase Program, Authorized Amount | $ 200,000,000 |  |

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- Definition One-time, aggregate corridor deductible on a claim that reaches an insurance layer. + References No definition available. + Details
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- Definition Minimum insurance layer prior to meeting the one-time corridor deductible. + References No definition available. + Details
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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + 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 (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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