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Long-Term Debt and Commercial Paper (Senior Unsecured Notes and Credit Agreement) (Details) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2018 | Nov. 07, 2017 USD ($) | Oct. 19, 2017 | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Letters of credit, amount outstanding | $ 49.3 |  |  |  |
Revolving Credit Facility Due 2019 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit agreement, maximum leverage ratio required |  |  |  | 3.75 |
Revolving Credit Facility Due 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit agreement, maximum leverage ratio required |  |  |  | 4.25 |
Maximum borrowing capacity under revolving credit facility | 1,800.0 |  |  |  |
Additional borrowing capacity under accordion feature of revolving credit facility | 500.0 |  |  |  |
Revolving credit facilities letter of credit sublimit | 200.0 |  |  |  |
Additional borrowing capacity under revolving credit facility | 1,800.0 |  |  |  |
Borrowing capacity limited under the maximum consolidated leverage ratio | $ 1,400.0 |  |  |  |
Leverage ratio, minimum threshold, current credit spread | 2.0 |  |  |  |
Leverage ratio, maximum threshold, current credit spread | 3.25 |  |  |  |
Leverage ratio, minimum threshold, increase in credit spread | 3.25 |  |  |  |
Impact on credit spread from increase in leverage ratio | 0.125% |  |  |  |
Senior Notes [Member] | Senior Notes at Three Point Five Percent Due 2024 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes | $ 450.0 |  | $ 450.0 |  | $ 0.0
Debt Instrument Percentage Aggregate Offering Price Percentage |  |  | 99.876% |  |
Percentage interest on debt instrument | 3.50% |  |  |  |
Senior Notes [Member] | Senior Notes at Three Point Eight Percent Due 2027 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes | $ 300.0 |  | $ 300.0 |  | 0.0
Debt Instrument Percentage Aggregate Offering Price Percentage |  |  | 99.925% |  |
Percentage interest on debt instrument | 3.80% |  |  |  |
Senior Notes [Member] | Senior Notes at Six Point Seven Five Percent due 2018 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes | $ 400.0 |  |  |  | 400.0
Percentage interest on debt instrument | 6.75% |  |  |  |
Senior Notes [Member] | Senior Notes at Five Point Five Percent Due 2020 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes | $ 350.0 |  |  |  | 350.0
Percentage interest on debt instrument | 5.50% |  |  |  |
Senior Notes [Member] | Senior Notes at Three Point Three Five Percent Due 2021 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes | $ 300.0 |  |  |  | 300.0
Percentage interest on debt instrument | 3.35% |  |  |  |
Senior Notes [Member] | Senior Notes at Four Point Five Percent Due 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes | $ 450.0 |  |  |  | $ 450.0
Percentage interest on debt instrument | 4.50% |  |  |  |
Minimum [Member] | Revolving Credit Facility Due 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Commitment fee on undrawn amounts | 0.15% |  |  |  |
Maximum [Member] | Revolving Credit Facility Due 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Commitment fee on undrawn amounts | 0.25% |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Line of Credit [Member] | Revolving Credit Facility Due 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable interest rates | 1.25% |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Line of Credit [Member] | Revolving Credit Facility Due 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable interest rates | 1.625% |  |  |  |
Base Rate [Member] | Minimum [Member] | Line of Credit [Member] | Revolving Credit Facility Due 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable interest rates | 0.25% |  |  |  |
Base Rate [Member] | Maximum [Member] | Line of Credit [Member] | Revolving Credit Facility Due 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable interest rates | 0.625% |  |  |  |
Scenario, Forecast [Member] | Revolving Credit Facility Due 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit agreement, maximum leverage ratio required |  | 3.75 |  |  |

X
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- Definition The minimum, inclusive, leverage ratio, as defined in the credit agreement, in which the credit spread on the revolver would increase based on the pricing terms outlined in the agreement. + References No definition available. + Details
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- Definition The maximum, exclusive, leverage ratio, as defined in the credit agreement, in which the current credit spread on the revolver applies based on pricing terms outlined in the credit agreement. + References No definition available. + Details
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- Definition The maximum leverage ratio required under the company's credit agreement, which is a contractually defined amount principally reflecting non-vehicle debt divided by a contractually defined measure of earnings with certain adjustments. + References No definition available. + Details
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- Definition Maximum amount of increase in the revolving credit facility allowed under the accordion feature of the credit agreement, subject to credit availability and certain other conditions. + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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 Reference 3: 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(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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