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Basis of Presentation and Responsibility for Interim Financial Statements - Adoption of New Accounting Standards (Details)
$ in Millions
6 Months Ended
Jun. 30, 2020
USD ($)
Accounting Policies [Abstract]  
Beginning balance $ 10.3
Bad debt expense (0.3)
Write-offs, net of recoveries (1.0)
Other (0.2)
Ending balance $ 8.8