Debt and Other Borrowings - Carrying Amounts and Fair Values of Debt Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
5.5% Senior Notes due in 2026 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	5.50%
Carrying Amount
Debt Instrument [Line Items]
Long-term debt, fair value	$ 351.4	$ 349.2
Carrying Amount | Other borrowings
Debt Instrument [Line Items]
Long-term debt, fair value	5.0	3.1
Carrying Amount | 5.5% Senior Notes due in 2026 | Senior Notes
Debt Instrument [Line Items]
Long-term debt, fair value	346.4	346.1
Fair Value
Debt Instrument [Line Items]
Long-term debt, fair value	355.9	369.4
Fair Value | Other borrowings
Debt Instrument [Line Items]
Long-term debt, fair value	5.0	3.1
Fair Value | 5.5% Senior Notes due in 2026 | Senior Notes
Debt Instrument [Line Items]
Long-term debt, fair value	$ 350.9	$ 366.3