Consolidated Statements of Shareholders' Equity Statement - USD ($) $ in Millions	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Treasury Stock	Non-Controlling Interests
Balance, beginning of period (in shares) at Dec. 31, 2017		116,303,729
Balance, beginning of period at Dec. 31, 2017	$ 2,857.6	$ 1.2	$ 3,302.6	$ 2,713.0	$ (288.2)	$ (2,953.7)	$ 82.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	97.0			97.0
Other comprehensive income (loss)	39.4				39.4
Issuances under equity plans (in shares)		437,703
Issuances under equity plans	(13.8)		2.9			(16.7)
Share-based compensation expense	7.5		7.5
Repurchases of common stock	(50.1)					(50.1)
Noncontrolling interest transactions	1.4		0.3				1.1
Balance, end of period (in shares) at Mar. 31, 2018		116,741,432
Balance, end of period at Mar. 31, 2018	2,939.0	$ 1.2	3,313.3	2,825.3	(264.1)	(3,020.5)	83.8
Balance, beginning of period (in shares) at Dec. 31, 2018		116,795,899
Balance, beginning of period at Dec. 31, 2018	2,698.5	$ 1.2	3,337.5	3,157.7	(399.8)	(3,471.7)	73.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	53.5			53.5
Other comprehensive income (loss)	(2.0)				(2.0)
Issuances under equity plans (in shares)		247,325
Issuances under equity plans	(4.9)		0.4			(5.3)
Share-based compensation expense	4.6		4.6
Repurchases of common stock	(101.0)					(101.0)
Noncontrolling interest transactions	1.2		0.5				0.7
Balance, end of period (in shares) at Mar. 31, 2019		117,043,224
Balance, end of period at Mar. 31, 2019	$ 2,649.9	$ 1.2	$ 3,343.0	$ 3,211.2	$ (401.8)	$ (3,578.0)	$ 74.3