Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ (156.3)	$ 7.9	$ 107.2
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax [Abstract]
Foreign currency translation adjustments	(1.3)	(13.3)	14.8
Translation of long-term loans to foreign subsidiaries	0.3	0.3	(2.0)
Revaluation loss on the sale of a business	0.0	0.0	2.1
Total translation adjustments	(1.0)	(13.0)	14.9
Interest rate swap adjustments	(10.7)	2.2	2.1
Pension benefit plan adjustments
Net gain (loss) arising during period	(8.1)	(18.1)	18.7
Settlement charge on pension benefit plans included in net earnings (loss)	0.0	0.0	0.8
Total pension benefit plan adjustments	(8.1)	(18.1)	19.5
Other comprehensive income (loss), before tax	(19.8)	(28.9)	36.5
Income tax impact related to items of other comprehensive income (loss)	4.8	4.0	(8.3)
Other comprehensive income (loss), net of tax	(15.0)	(24.9)	28.2
Total comprehensive income (loss)	(171.3)	(17.0)	135.4
Less: comprehensive loss attributable to noncontrolling interests	0.0	(0.6)	0.0
Comprehensive income (loss) attributable to Quad common shareholders	$ (171.3)	$ (16.4)	$ 135.4