Accumulated Other Comprehensive Loss - Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold	$ 967.6	$ 958.1	$ 932.2	$ 922.6	$ 882.1	$ 936.6	$ 938.7	$ 965.5	$ 3,780.5	$ 3,722.9	$ 3,495.9
Tax (expense)									(227.2)	(222.1)	(214.6)
Gain net of tax	$ 225.2	$ 256.7	$ 245.5	$ 164.5	$ 199.4	$ 227.8	$ 219.1	$ 138.4	891.9	784.7	$ 757.6
Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain net of tax									(8.2)	(7.0)
Cash flow hedges gain (loss) | Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold									0.7	0.6
Total before tax									0.7	0.6
Tax (expense)									(0.3)	(0.1)
Gain net of tax									0.4	0.5
Amortization of defined benefit pension and post retirement benefit items | Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax									(11.1)	(9.9)
Tax (expense)									2.5	2.4
Gain net of tax									(8.6)	(7.5)
Prior-service credits | Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax									(0.4)	(0.4)
Actuarial gains/(losses) | Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax									$ (10.7)	$ (9.5)