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Cash Flow Information - Reconciliation of Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]        
Cash and cash equivalents $ 23.8 $ 15.9    
Restricted cash, included in other assets 4.3 2.8    
Total cash, cash equivalents and restricted cash $ 28.1 $ 18.7 $ 29.6 $ 24.2