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Lines of Credit and Financing Arrangements (Senior Unsecured Notes) (Details) - Senior Unsecured Notes [Member] - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Nov. 01, 2016
Debt Instrument [Line Items] |  |  |
Debt issued |  |  | $ 350,000,000
Fixed interest rate for senior unsecured notes |  |  | 3.00%
Maturity date of senior unsecured notes | Nov. 15, 2023 |  |
Minimum amount of principal or interest due on indebtedness or receivable securitization |  | $ 75,000,000 |
Number of days within notice date acceleration is not rescinded |  | 30 days |

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