Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net earnings (loss)	$ 111.6	$ (64.4)	$ 173.6	$ (62.7)
Other comprehensive income (loss):
Foreign currency translation adjustments	28.3	37.3	(68.2)	(47.6)
Translation adjustments on derivative instruments, net of income taxes of $(4.2), $(5.3), $10.2 and $0.1, respectively	(14.2)	(9.3)	35.4	1.4
Translation adjustments of long-term intercompany loans	0.6	(1.9)	6.2	(0.4)
Defined benefit pension plans and retiree health care plan, net of income taxes of $2.3, $(0.1), $2.6 and $7.6, respectively	0.8	0.6	1.6	1.9
Pension settlement related to a U.S. plan, net of income taxes of $3.9 for 2020	0.0	0.0	0.0	6.6
Total other comprehensive loss	15.5	26.7	(25.0)	(38.1)
Comprehensive income (loss)	$ 127.1	$ (37.7)	$ 148.6	$ (100.8)