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Lines of Credit and Financing Arrangements (Domestic Credit Facility) (Details) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2015 | Nov. 13, 2014
Line of Credit Facility [Line Items] |  |  |  |
Proceeds from the facilities |  |  | $ 79,000,000 |
Revolving Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit, maximum borrowing capacity |  |  |  | $ 650,000,000
Domestic Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Outstanding borrowings |  | $ 367,000,000 |  |
Standby letters of credit |  | 2,900,000 |  |
Line of credit, available for future borrowings |  | 500,100,000 |  |
Maximum increase in credit facility |  | 350,000,000 |  |
Domestic Credit Facility [Member] | Medium-term Notes [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, face amount |  |  |  | $ 250,000,000
Outstanding borrowings |  | 220,000,000 |  |
Quarterly principal repayments |  | 7,500,000 |  |
Proceeds from the facilities | $ 30,000,000 |  |  |
Letter of Credit [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit, maximum borrowing capacity |  | 100,000,000 |  |
Subfacility for Swingline Loans [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit, maximum borrowing capacity |  | 65,000,000 |  |
Line of Credit [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Minimum amount of principal or interest due on indebtedness or receivable securitization |  | $ 75,000,000.0 |  |

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- Definition Minimum amount of principal or interest due on indebtedness or receivable securitization. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Amount of the required periodic payments applied to principal. + 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 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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 Reference 3: 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 + Details
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