Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Millions	Total	Common stock [Member]	Treasury Stock [Member]	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			32,700,000
Dividends Declared [Table Text Block]	1.92
Balance at beginning of year at Dec. 31, 2019		67,500,000
Balance at beginning of period, Common Stock at Dec. 31, 2019		$ 41.8
Balance at beginning of period at Dec. 31, 2019			$ (1,364.5)	$ 720.1	$ 2,601.3	$ (163.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, Shares		300,000
Issuance of common stock		$ 0.1
Stock repurchases, Shares	0
Share-based compensation effects				15.3
Net income	$ 151.3
Dividends declared ($2.08 in 2022, $2.00 in 2021 and $1.92 in 2020)					70.5
Other comprehensive income (loss)	26.1
Balance at end of period, Common Stock, Shares at Dec. 31, 2020		67,800,000
Balance at end of period, Common Stock at Dec. 31, 2020		$ 41.9
Balance at end of period at Dec. 31, 2020	1,957.4		$ (1,364.5)	735.4	2,682.1	(137.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Repurchased During Period, Value	$ 0.0
Balance at beginning of period, Shares			32,700,000
Dividends Declared [Table Text Block]	2.00
Issuance of common stock, Shares		500,000
Issuance of common stock		$ 0.3
Stock repurchases, Shares	100,000
Share-based compensation effects				28.4
Net income	$ 143.1
Dividends declared ($2.08 in 2022, $2.00 in 2021 and $1.92 in 2020)					73.7
Other comprehensive income (loss)	$ (23.1)
Balance at end of period, Common Stock, Shares at Dec. 31, 2021	68,254,574	68,300,000
Balance at end of period, Common Stock at Dec. 31, 2021	$ 42.2	$ 42.2
Balance at end of period at Dec. 31, 2021	2,019.2		$ (1,377.7)	763.8	2,751.5	(160.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Repurchased During Period, Value	$ 13.2
Balance at beginning of period, Shares			32,800,000
Dividends Declared [Table Text Block]	2.08
Issuance of common stock, Shares		300,000
Issuance of common stock		$ 0.2
Stock repurchases, Shares	500,000
Share-based compensation effects				28.4
Net income	$ 155.9
Dividends declared ($2.08 in 2022, $2.00 in 2021 and $1.92 in 2020)					75.9
Other comprehensive income (loss)	$ (51.0)
Balance at end of period, Common Stock, Shares at Dec. 31, 2022	68,575,974	68,600,000
Balance at end of period, Common Stock at Dec. 31, 2022	$ 42.4	$ 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