Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Millions	Total	Common stock [Member]	Treasury Stock, Common	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period, Shares			32,800,000
Dividends Declared [Table Text Block]	2.08
Balance at beginning of year at Dec. 31, 2021		68,300,000
Balance at beginning of period, Common Stock at Dec. 31, 2021		$ 42.2
Balance at beginning of period at Dec. 31, 2021			$ (1,377.7)	$ 763.8	$ 2,751.5	$ (160.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, Shares		300,000
Issuance of common stock		$ 0.2
Stock repurchases, Shares	472,609
Share-based compensation effects				28.4
Net income	$ 155.9
Dividends declared per share ($2.32 in 2024, $2.20 in 2023 and $2.08 in 2022)					75.9
Other comprehensive income (loss)	(51.0)
Balance at end of period, Common Stock, Shares at Dec. 31, 2022		68,600,000
Balance at end of period, Common Stock at Dec. 31, 2022		$ 42.4
Balance at end of period at Dec. 31, 2022	2,029.6		$ (1,424.9)	792.2	2,831.5	(211.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Repurchased During Period, Value	$ 47.2
Balance at beginning of period, Shares			33,300,000
Dividends Declared [Table Text Block]	2.20
Issuance of common stock, Shares		200,000
Issuance of common stock		$ 0.1
Stock repurchases, Shares	24,520
Share-based compensation effects				23.9
Net income	$ 259.2
Dividends declared per share ($2.32 in 2024, $2.20 in 2023 and $2.08 in 2022)					81.2
Other comprehensive income (loss)	$ 44.0
Balance at end of period, Common Stock, Shares at Dec. 31, 2023	68,797,027	68,800,000
Balance at end of period, Common Stock at Dec. 31, 2023	$ 42.5	$ 42.5
Balance at end of period at Dec. 31, 2023	2,273.0		$ (1,427.5)	816.1	3,009.5	(167.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Repurchased During Period, Value	$ 2.6
Balance at beginning of period, Shares			33,300,000
Dividends Declared [Table Text Block]	2.32
Issuance of common stock, Shares		300,000
Issuance of common stock		$ 0.2
Stock repurchases, Shares	167,452
Share-based compensation effects				31.0
Net income	$ 284.2
Dividends declared per share ($2.32 in 2024, $2.20 in 2023 and $2.08 in 2022)					85.6
Other comprehensive income (loss)	$ (42.0)
Balance at end of period, Common Stock, Shares at Dec. 31, 2024	69,075,329	69,100,000
Balance at end of period, Common Stock at Dec. 31, 2024	$ 42.7	$ 42.7
Balance at end of period at Dec. 31, 2024	2,438.9		$ (1,449.4)	$ 847.1	$ 3,208.1	$ (209.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Repurchased During Period, Value	$ 21.9
Balance at beginning of period, Shares			33,500,000