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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Comprehensive income
Net earnings (loss)	$ (13.5)	$ (54.8)	$ 49.4	$ (130.2)	$ 170.6	$ (100.4)	$ 22.2	$ 17.7	$ (149.1)	$ 110.1	$ (487.2)
Unrealized foreign currency translation adjustment, net of tax									(16.5)	(127.7)	131.7
Realized loss on foreign currency transactions reclassified into other expense, net of tax									0.5	1.0
Pension and other benefit adjustments:
Net gain (loss) arising during the period, net of tax									(15.5)	4.2	(3.0)
Marketable securities:
Unrealized net holding gain arising during the period, net of tax										0.2	0.7
Realized net gain reclassified into investment income, net of tax											(0.4)
Equity method investee's cash flow hedge:
Unrealized net holding gain (loss) arising during the period, net of tax									(0.1)	0.2
Realized net gain reclassified into equity in earnings of non-consolidated entities, net of tax										(2.2)	(0.9)
Other comprehensive income (loss):									(31.6)	(124.5)	128.1
Total comprehensive loss									$ (180.7)	$ (14.4)	$ (359.1)