Financial Derivatives - Summary of Combined Fair Values, Net of Tax of Interest Rate Derivative Instruments (Details) - USD ($) $ in Millions		Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative [Line Items]
Derivative fair value, net of tax	[1]	$ (4.1)	$ (7.7)	$ (13.4)

[1] Assets are included in the condensed consolidated balance sheets in prepaid expenses and other current assets, while liabilities are included in accrued expenses.