Intangible Assets, net (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	May 01, 2023	Dec. 31, 2022
Intangible assets subject to amortization:
Intangible assets subject to amortization, Gross Carrying Amount	$ 749.5			$ 745.8
Intangible assets subject to amortization, Accumulated Amortization	(515.3)			(491.9)
Intangible assets
Intangible assets, Gross Carrying Amount	1,518.1			1,511.5
Amortization expense for intangible assets	23.0	$ 24.3
Changes in intangible assets due to foreign currency translation gains (losses)	1.2	$ (1.6)
Summary of estimated aggregate amortization expense for each of the succeeding five years
2023 (remaining six months)	20.8
2024	40.5
2025	36.3
2026	26.8
2027	26.2
Thereafter	83.6
Total	234.2
Southern Steel
Intangible assets
Intangible assets recorded in connection with acquisition			$ 5.0
Trade names
Intangible assets not subject to amortization:
Intangible assets not subject to amortization, Gross Carrying Amount	$ 768.6			765.7
Customer lists/relationships
Intangible assets subject to amortization:
Weighted average amortizable life in years	14 years 2 months 12 days
Intangible assets subject to amortization, Gross Carrying Amount	$ 716.4			713.6
Intangible assets subject to amortization, Accumulated Amortization	$ (501.2)			(479.3)
Backlog of orders
Intangible assets subject to amortization:
Weighted average amortizable life in years	7 years 10 months 24 days
Intangible assets subject to amortization, Gross Carrying Amount	$ 22.8			22.3
Intangible assets subject to amortization, Accumulated Amortization	$ (4.6)			(3.1)
Other
Intangible assets subject to amortization:
Weighted average amortizable life in years	9 years 4 months 24 days
Intangible assets subject to amortization, Gross Carrying Amount	$ 10.3			9.9
Intangible assets subject to amortization, Accumulated Amortization	$ (9.5)			$ (9.5)