Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) earnings	$ (64.4)	$ 127.3	$ (62.7)	$ 180.8
Other comprehensive income (loss):
Foreign currency translation adjustments	37.3	32.9	(47.6)	2.3
Reclassification of currency translation adjustment to income related to disposition of partially held equity interest		(32.5)		(32.5)
Translation adjustments on derivative instruments, net of income taxes of $(5.3), $(3.1), $0.1 and $2.0, respectively	(9.3)	(11.1)	1.4	6.3
Translation adjustments of long-term intercompany loans	(1.9)	(4.2)	(0.4)	6.8
Defined benefit pension plans and retiree health care plan, net of income taxes of $(0.1), $0.0, $7.6 and $0.1, respectively	0.6	0.2	1.9	0.4
Pension settlement related to a U.S. plan, net of income taxes of $(3.9)			6.6
Total other comprehensive income (loss)	26.7	(14.7)	(38.1)	(16.7)
Comprehensive (loss) income	$ (37.7)	$ 112.6	$ (100.8)	$ 164.1