Basis of Presentation and Summary of Significant Accounting Policies - Insurance Subsidiary (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Liability for Claims and Claims Adjustment Expense [Line Items]
Reserve for policy claims	$ 54.7	$ 60.9
Other Current Liabilities
Liability for Claims and Claims Adjustment Expense [Line Items]
Reserve for policy claims	13.1	13.2
Other Noncurrent Liabilities
Liability for Claims and Claims Adjustment Expense [Line Items]
Reserve for policy claims	$ 41.6	$ 47.7