CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Income Statement [Abstract]
Revenue	$ 3,194.0	$ 2,499.5	$ 8,736.0	$ 7,100.3
Cost of sales	2,777.9	2,238.9	7,675.0	6,363.8
Gross profit	416.1	260.6	1,061.0	736.5
Selling, general and administrative expenses	38.4	91.8	189.8	235.9
Research and development	36.4	18.7	88.0	54.6
Amortization of intangible assets	11.4	11.1	33.6	32.0
Restructuring and other charges, net of recoveries	4.9	1.0	23.3	17.3
Earnings from operations	325.0	138.0	726.3	396.7
Finance costs	12.8	11.2	40.0	40.2
Miscellaneous expense	1.3	2.8	4.4	13.8
Earnings before income taxes	310.9	124.0	681.9	342.7
Income tax expense (recovery)
Current	44.2	39.1	133.0	88.4
Deferred	(1.1)	(4.6)	(16.1)	(22.0)
Income tax expense	43.1	34.5	116.9	66.4
Net earnings	$ 267.8	$ 89.5	$ 565.0	$ 276.3
Earnings per share:
Basic (in dollars per share)	$ 2.33	$ 0.76	$ 4.90	$ 2.33
Diluted (in dollars per share)	$ 2.31	$ 0.75	$ 4.86	$ 2.32
Weighted-average shares used in computing per share amounts (in millions):
Basic (in shares)	115.0	118.2	115.4	118.7
Diluted (in shares)	115.9	118.9	116.2	119.1