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DEBT AND BANK CREDIT FACILITIES - Schedule of Indebtedness (Details) € in Millions, $ in Millions	Sep. 30, 2026 USD ($)	Sep. 30, 2026 EUR (€)	Dec. 31, 2025 USD ($)
Debt Instrument [Line Items]
Finance Leases	$ 92.3		$ 93.8
Less: Debt Issuance Costs	(27.0)		(30.4)
Total	4,452.2		4,788.7
Less: Current Maturities	24.7		24.1
Long-Term Debt	4,427.5		4,764.6
Senior Notes
Debt Instrument [Line Items]
Long-term debt	3,600.0		4,700.0
Senior Notes \| Altra Notes
Debt Instrument [Line Items]
Long-term debt	18.1		18.1
Line of Credit \| Unsecured Debt \| 2025 Term Facility
Debt Instrument [Line Items]
Long-term debt	500.0		0.0
Line of Credit \| Revolving Credit Facility \| 2025 Revolving Facility
Debt Instrument [Line Items]
Long-term debt	268.8		0.0
Line of Credit \| Revolving Credit Facility \| Credit Agreement, Revolving Facility, 2025, Euro-denominated Borrowings
Debt Instrument [Line Items]
Long-term debt	260.9	€ 230.0
Other
Debt Instrument [Line Items]
Long-term debt	$ 0.0		$ 7.2