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Basis of Presentation (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 33 Months Ended
Jan. 11, 2017
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2019
Dec. 31, 2016
Business Acquisition [Line Items]            
Payments to Acquire Businesses, Gross $ 4.0 $ 2.5        
Noncash Investing and Financing Items [Abstract]            
Purchases of property and equipment included in accounts payable     $ 2.9 $ 6.3    
Scenario, Forecast [Member]            
Business Acquisition [Line Items]            
Payments to Acquire Businesses, Gross         $ 1.5  
Other Noncurrent Assets [Member] | Accounting Standards Update 2016-16 [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member]            
Business Acquisition [Line Items]            
Cumulative Effect of New Accounting Principle in Period of Adoption           $ (0.1)