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Fair Value Measurements (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Derivative [Line Items]    
Long-term Debt, Gross $ 739.2  
Fixed rate debt    
Derivative [Line Items]    
Long-term Debt, Gross 681.8 $ 701.4
Value of debt 703.6 702.0
Variable rate debt    
Derivative [Line Items]    
Value of debt $ 54.0 $ 19.0