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Lines of Credit and Financing Arrangements (Senior Unsecured Notes) (Details) - Senior Unsecured Notes [Member] - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Nov. 01, 2016
Debt Instrument [Line Items] |  |  |
Senior unsecured notes |  |  | $ 350,000,000.0
Fixed interest rate for senior unsecured notes (as a percent) |  |  | 3.00%
Maturity date of senior unsecured notes | Nov. 15, 2023 |  |
Minimum principal amount accelerated |  | $ 75,000,000.0 |
Notice period |  | 30 days |

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