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Debt - Summary of Carrying Amounts and Estimated Fair Values of Long-Term Borrowings (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term borrowings $ 209.4 $ 210.1
Current portion of long-term borrowings and finance lease obligations 0.2 0.2
Notional Amount    
Debt Instrument [Line Items]    
Long-term borrowings [1] 209.4 210.1
Fair Value    
Debt Instrument [Line Items]    
Long-term borrowings [1] $ 209.4 $ 210.1
[1]
Long-term borrowings includes current portions of long-term debt and current portions of finance lease obligations of $0.2 million and $0.2 million as of June 30, 2019 and December 31, 2018, respectively.