Investments - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Total assets	$ 51,615.8	$ 38,358.4	$ 33,236.1
Total liabilities of variable interest entities	$ 40,800.5	29,168.2
Ownership interest held	50.00%
Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest held	12.00%
Chem-Mod Clean-Coal Venture [Member] | VIE [Member]
Schedule of Equity Method Investments [Line Items]
Total assets	$ 0.5	14.8
Total liabilities of variable interest entities	0.5	1.1
Chem-Mod Clean-Coal Venture - U.S. and Canadian Operations [Member]
Schedule of Equity Method Investments [Line Items]
Total revenues of limited liability companies	0.4	1.0
Total expenses of limited liability companies	$ 25.8	$ 5.7
Chem-Mod International LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest held	31.50%
Chem Mod L L C [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest held	46.50%