Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Non-Controlling Interests
Balance, beginning of period at Dec. 31, 2019	$ 2,761.5	$ 1.2	$ 3,370.6	$ 3,494.1	$ (441.0)	$ (3,681.9)	$ 18.5
Balance, beginning of period (in shares) at Dec. 31, 2019		117,190,883
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	1.7			1.7
Other comprehensive income (loss)	(64.8)				(64.8)
Issuances under equity plans	(0.5)		5.9			(6.4)
Issuances under equity plans (in shares)		293,298
Share-based compensation expense	4.6		4.6
Repurchases of common stock	(63.8)					(63.8)
Noncontrolling interest transactions	0.3						0.3
Balance, end of period at Mar. 31, 2020	2,639.0	$ 1.2	3,381.1	3,495.8	(505.8)	(3,752.1)	18.8
Balance, end of period (in shares) at Mar. 31, 2020		117,484,181
Balance, beginning of period at Dec. 31, 2019	2,761.5	$ 1.2	3,370.6	3,494.1	(441.0)	(3,681.9)	18.5
Balance, beginning of period (in shares) at Dec. 31, 2019		117,190,883
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	(52.4)
Other comprehensive income (loss)	8.2
Balance, end of period at Sep. 30, 2020	2,605.4	$ 1.2	3,395.1	3,378.5	(432.8)	(3,753.3)	16.7
Balance, end of period (in shares) at Sep. 30, 2020		117,543,804
Balance, beginning of period at Mar. 31, 2020	2,639.0	$ 1.2	3,381.1	3,495.8	(505.8)	(3,752.1)	18.8
Balance, beginning of period (in shares) at Mar. 31, 2020		117,484,181
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	(64.4)			(64.4)
Other comprehensive income (loss)	26.7				26.7
Issuances under equity plans	(0.2)					(0.2)
Issuances under equity plans (in shares)		14,898
Share-based compensation expense	6.9		6.9
Dividends	(63.2)			(63.2)
Noncontrolling interest transactions	(2.0)						(2.0)
Balance, end of period at Jun. 30, 2020	2,542.8	$ 1.2	3,388.0	3,368.2	(479.1)	(3,752.3)	16.8
Balance, end of period (in shares) at Jun. 30, 2020		117,499,079
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	10.3			10.3
Other comprehensive income (loss)	46.3				46.3
Issuances under equity plans	(0.8)		0.2			(1.0)
Issuances under equity plans (in shares)		44,725
Share-based compensation expense	6.9		6.9
Noncontrolling interest transactions	(0.1)						(0.1)
Balance, end of period at Sep. 30, 2020	2,605.4	$ 1.2	3,395.1	3,378.5	(432.8)	(3,753.3)	16.7
Balance, end of period (in shares) at Sep. 30, 2020		117,543,804
Balance, beginning of period at Dec. 31, 2020	2,453.6	$ 1.2	3,402.5	3,388.8	(397.3)	(3,954.2)	12.6
Balance, beginning of period (in shares) at Dec. 31, 2020		117,555,991
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	62.0			62.0
Other comprehensive income (loss)	(40.5)				(40.5)
Issuances under equity plans	(3.6)		1.0			(4.6)
Issuances under equity plans (in shares)		169,192
Share-based compensation expense	7.5		7.5
Repurchases of common stock	(100.1)					(100.1)
Noncontrolling interest transactions	(1.5)						(1.5)
Balance, end of period at Mar. 31, 2021	2,377.4	$ 1.2	3,411.0	3,450.8	(437.8)	(4,058.9)	11.1
Balance, end of period (in shares) at Mar. 31, 2021		117,725,183
Balance, beginning of period at Dec. 31, 2020	2,453.6	$ 1.2	3,402.5	3,388.8	(397.3)	(3,954.2)	12.6
Balance, beginning of period (in shares) at Dec. 31, 2020		117,555,991
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	271.3
Other comprehensive income (loss)	(47.3)
Balance, end of period at Sep. 30, 2021	2,483.2	$ 1.2	3,434.0	3,591.8	(444.6)	(4,109.0)	9.8
Balance, end of period (in shares) at Sep. 30, 2021		117,758,023
Balance, beginning of period at Mar. 31, 2021	2,377.4	$ 1.2	3,411.0	3,450.8	(437.8)	(4,058.9)	11.1
Balance, beginning of period (in shares) at Mar. 31, 2021		117,725,183
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	111.6			111.6
Other comprehensive income (loss)	15.5				15.5
Issuances under equity plans	2.6		2.7			(0.1)
Issuances under equity plans (in shares)		25,653
Share-based compensation expense	9.4		9.4
Dividends	(68.3)			(68.3)
Repurchases of common stock	(50.0)					(50.0)
Noncontrolling interest transactions	(1.5)						(1.5)
Balance, end of period at Jun. 30, 2021	2,396.7	$ 1.2	3,423.1	3,494.1	(422.3)	(4,109.0)	9.6
Balance, end of period (in shares) at Jun. 30, 2021		117,750,836
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	97.7			97.7
Other comprehensive income (loss)	(22.3)				(22.3)
Issuances under equity plans	1.1		1.1
Issuances under equity plans (in shares)		7,187
Share-based compensation expense	9.8		9.8
Noncontrolling interest transactions	0.2						0.2
Balance, end of period at Sep. 30, 2021	$ 2,483.2	$ 1.2	$ 3,434.0	$ 3,591.8	$ (444.6)	$ (4,109.0)	$ 9.8
Balance, end of period (in shares) at Sep. 30, 2021		117,758,023