Debt - Summary of Components of Long-Term Borrowings and Finance Lease Obligations (Details) - USD ($) $ in Millions		Sep. 30, 2021		Dec. 31, 2020
Debt Instrument [Line Items]
Long-term borrowings		$ 250.2	[1]	$ 209.4
Finance lease obligations		2.2		0.6
Total long-term borrowings and finance lease obligations, including current portion		252.4		210.0
Current finance lease obligations	[2]	0.6		0.2
Total long-term borrowings and finance lease obligations		$ 251.8		$ 209.8

[1] Defined as the Second Amended and Restated Credit Agreement, dated July 30, 2019. Amounts at September 30, 2021 include incremental borrowings to fund a portion of the Ground Force acquisition, which was completed on October 4, 2021 - see Note 14 – Subsequent Events.(b)    Amounts at September 30, 2021 include finance lease obligations acquired in connection with the OSW acquisition - see Note 2 – Acquisitions.

[2] Amounts at September 30, 2021 include finance lease obligations acquired in connection with the OSW acquisition - see Note 2 – Acquisitions.