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Debt and Credit Arrangements - 2018 Notes (Details) - Convertible Notes, Due 2018 - Convertible Debt - USD ($) $ / shares in Units, $ in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Aug. 01, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Debt Instrument |  |  |
Debt instrument stated interest rate (percent) | 2.00% |  |
Debt instrument face amount | $ 57.1 | $ 0.0 | $ 57.1
Repayment of debt | 57.1 |  |
Interest paid | $ 0.6 |  |
Debt instrument strike price (per share) |  | $ 84.96 |

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