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Fair Value Measurements (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative [Line Items] |  |
Long-term Debt, Gross | $ 931.9 |
Fixed rate debt |  |
Derivative [Line Items] |  |
Long-term Debt, Gross | 680.6 | $ 701.4
Value of debt | 713.5 | 702.0
Variable rate debt |  |
Derivative [Line Items] |  |
Value of debt | $ 248.0 | $ 19.0

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