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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 | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Nov. 01, 2016 | May 31, 2010
Debt Instrument [Line Items] |  |  |  |  |
Senior unsecured notes |  |  |  | $ 350,000,000.0 | $ 200,000,000.0
Fixed interest rate for senior unsecured notes (as a percent) |  |  |  | 3.00% |
Maturity date of senior unsecured notes | Nov. 15, 2023 |  | May 15, 2017 |  |
Minimum principal amount accelerated |  | $ 75,000,000.0 |  |  |
Notice period |  | 30 days |  |  |

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