Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Defined Benefit Pension Plans	Cumulative Translation Adjustment	Deferred Gains (Losses) on Derivatives	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2019		75,471,562
Stockholders' equity, beginning of period at Dec. 31, 2019	$ 2,907.0	$ 0.8	$ 4.7	$ 4,443.5	$ (1,595.2)	$ (296.4)	$ (1,297.5)	$ (1.3)	$ 53.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	419.8			427.1					(7.3)
Payment of dividends to shareholders	(48.0)			(48.0)
Issuance of non-employee director restricted stock (in shares)		19,862
Issuance of non-employee director restricted stock	1.1		1.1
Issuance of stock awards (in shares)		374,212
Issuance of stock awards	(15.7)		(7.3)	(8.4)
SSARs exercised (in shares)		66,736
SSARs exercised	(4.2)		(4.1)	(0.1)
Stock compensation	36.5		39.9	(3.4)
Investment by noncontrolling interests	0.2								0.2
Distribution to noncontrolling interest	(3.3)								(3.3)
Changes in/Sale of noncontrolling interest	(0.5)								(0.5)
Purchases and retirement of common stock (in shares)		(970,141)
Purchases and retirement of common stock	(55.0)		(3.4)	(51.6)
Defined benefit pension plans, net of taxes:
Prior service (cost) credit arising during the year	0.3				0.3	0.3
Net (gain) loss recognized due to settlement	0.3				0.3	0.3
Net loss recognized due to curtailment	0.0
Net actuarial gain (loss) arising during the year	(32.7)				(32.7)	(32.7)
Amortization of prior service cost included in net periodic pension cost	2.1				2.1	2.1
Amortization of net actuarial losses included in net periodic pension cost	13.1				13.1	13.1
Deferred gains and losses on derivatives, net	(1.2)				(1.2)			(1.2)
Foreign currency translation adjustments	(201.8)				(197.5)		(197.5)		(4.3)
Ending balance (in shares) at Dec. 31, 2020		74,962,231
Stockholders' equity, end of period at Dec. 31, 2020	3,018.0	$ 0.8	30.9	4,759.1	(1,810.8)	(313.3)	(1,495.0)	(2.5)	38.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	901.5			897.0					4.5
Payment of dividends to shareholders	(358.5)			(358.5)
Issuance of non-employee director restricted stock (in shares)		8,912
Issuance of non-employee director restricted stock	1.3		1.3
Issuance of stock awards (in shares)		362,034
Issuance of stock awards	(29.5)		(29.5)
SSARs exercised (in shares)		60,339
SSARs exercised	(5.4)		(5.4)
Stock compensation	26.1		26.1
Distribution to noncontrolling interest	(3.6)								(3.6)
Investment by noncontrolling interests	(10.6)								(10.6)
Purchases and retirement of common stock (in shares)		(952,204)
Purchases and retirement of common stock	(135.0)	$ (0.1)	(19.5)	(115.4)
Defined benefit pension plans, net of taxes:
Prior service (cost) credit arising during the year	10.0				10.0	10.0
Net (gain) loss recognized due to settlement	0.1				0.1	0.1
Net loss recognized due to curtailment	6.3				6.3	6.3
Net actuarial gain (loss) arising during the year	53.6				53.6	53.6
Amortization of prior service cost included in net periodic pension cost	0.6				0.6	0.6
Amortization of net actuarial losses included in net periodic pension cost	12.3				12.3	12.3
Deferred gains and losses on derivatives, net	2.1				2.1			2.1
Foreign currency translation adjustments	(45.5)				(45.1)		(45.1)		(0.4)
Ending balance (in shares) at Dec. 31, 2021		74,441,312
Stockholders' equity, end of period at Dec. 31, 2021	3,443.8	$ 0.7	3.9	5,182.2	(1,770.9)	(230.4)	(1,540.1)	(0.4)	27.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	874.7			889.6					(14.9)
Payment of dividends to shareholders	(404.3)			(404.3)
Issuance of non-employee director restricted stock (in shares)		10,301
Issuance of non-employee director restricted stock	1.5		1.5
Issuance of stock awards (in shares)		250,719
Issuance of stock awards	(19.4)		(6.5)	(12.9)
SSARs exercised (in shares)		12,307
SSARs exercised	(1.2)		(1.2)
Stock compensation	32.5		32.5
Distribution to noncontrolling interest	(13.8)								(13.8)
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	0.1								0.1
Purchases and retirement of common stock (in shares)		(113,824)
Defined benefit pension plans, net of taxes:
Prior service (cost) credit arising during the year	(19.1)				(19.1)	(19.1)
Net (gain) loss recognized due to settlement	(0.4)				(0.4)	(0.4)
Net loss recognized due to curtailment	0.0
Net actuarial gain (loss) arising during the year	12.3				12.3	12.3
Amortization of prior service cost included in net periodic pension cost	0.0
Amortization of net actuarial losses included in net periodic pension cost	6.4				6.4	6.4
Deferred gains and losses on derivatives, net	(0.5)				(0.5)			(0.5)
Foreign currency translation adjustments	(30.0)				(30.9)		(30.9)		0.9
Ending balance (in shares) at Dec. 31, 2022		74,600,815
Stockholders' equity, end of period at Dec. 31, 2022	$ 3,882.6	$ 0.7	$ 30.2	$ 5,654.6	$ (1,803.1)	$ (231.2)	$ (1,571.0)	$ (0.9)	$ 0.2