Quarterly Information (Unaudited) - Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	$ 1,195.0	$ 1,426.8	$ 1,500.9	$ 1,072.6	$ 5,195.3	$ 5,341.3	$ 4,981.9
Cost of goods sold	805.7	939.6	983.4	731.7	3,460.5	3,563.8	3,432.7
Gross Profit	389.3	487.2	517.5	340.9	1,734.8	1,777.5	1,549.2
Operating Income (Loss)	195.8	328.8	349.0	168.0	1,041.5	1,040.4	791.5
Income before income taxes	178.7	317.4	340.0	160.8	996.8	999.4	738.9
Income Tax Expense (Benefit)	36.2	57.5	66.1	31.2	191.0	188.3	147.7
Net Income (Loss) Attributable to Parent	$ 142.5	$ 259.9	$ 273.9	$ 129.6	$ 805.8	$ 811.1	$ 591.2
Basic Earnings (Loss) per Share (in usd per share)	$ 4.08	$ 7.41	$ 7.75	$ 3.65	$ 22.89	$ 22.78	$ 16.65
Diluted Earnings (Loss) per Share (in usd per share)	$ 4.07	$ 7.38	$ 7.71	$ 3.63	$ 22.79	$ 22.66	$ 16.58
As Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	$ 1,195.0	$ 1,426.8	$ 1,500.9	$ 1,072.6		$ 5,341.3	$ 4,981.9
Cost of goods sold	809.4	958.2	978.4	744.1		3,569.4	3,434.1
Gross Profit	385.6	468.6	522.5	328.5		1,771.9	1,547.8
Operating Income (Loss)	192.1	310.2	354.0	155.6		1,034.8	790.1
Income before income taxes	175.0	298.8	345.0	148.4		993.8	737.5
Income Tax Expense (Benefit)	35.3	53.0	67.4	28.1		186.9	147.4
Net Income (Loss) Attributable to Parent	$ 139.7	$ 245.8	$ 277.6	$ 120.3		$ 806.9	$ 590.1
Basic Earnings (Loss) per Share (in usd per share)	$ 4.00	$ 7.01	$ 7.86	$ 3.39		$ 22.67	$ 16.61
Diluted Earnings (Loss) per Share (in usd per share)	$ 3.99	$ 6.98	$ 7.82	$ 3.37		$ 22.54	$ 16.54
Immaterial Error Correction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues		$ 0.0	$ 0.0	$ 0.0
Cost of goods sold		(5.4)	1.5	(5.1)
Gross Profit		5.4	(1.5)	5.1
Operating Income (Loss)		5.4	(1.5)	5.1
Income before income taxes		5.4	(1.5)	5.1
Income Tax Expense (Benefit)		1.3	(0.4)	1.3
Net Income (Loss) Attributable to Parent		$ 4.1	$ (1.1)	$ 3.8
Basic Earnings (Loss) per Share (in usd per share)		$ 0.12	$ (0.03)	$ 0.11
Diluted Earnings (Loss) per Share (in usd per share)		$ 0.12	$ (0.03)	$ 0.11
Impact of LIFO Change
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Cost of goods sold	3.7	(13.2)	3.5	(7.3)
Gross Profit	(3.7)	13.2	(3.5)	7.3
Operating Income (Loss)	(3.7)	13.2	(3.5)	7.3
Income before income taxes	(3.7)	13.2	(3.5)	7.3
Income Tax Expense (Benefit)	(0.9)	3.2	(0.9)	1.8
Net Income (Loss) Attributable to Parent	$ (2.8)	$ 10.0	$ (2.6)	$ 5.5
Basic Earnings (Loss) per Share (in usd per share)	$ (0.08)	$ 0.28	$ (0.08)	$ 0.15
Diluted Earnings (Loss) per Share (in usd per share)	$ (0.08)	$ 0.28	$ (0.08)	$ 0.15