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Other Financial Information - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]            
Cash and cash equivalents $ 369.7 $ 223.5   $ 215.1 $ 388.0  
Restricted cash included in other current assets 10.2 10.2        
Total cash, cash equivalents, and restricted cash $ 379.9 $ 233.7 $ 120.3 $ 225.3 $ 398.2 $ 249.6