Restructuring, Impairment and Transaction-Related Charges - Schedule of Restructuring Reserves (Details) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($)
Restructuring Reserve [Roll Forward]
Balance, beginning of period	$ 62.1
Expense, net	23.1
Cash payments, net	(27.0)
Non-cash adjustments/reclassifications	(46.4)
Balance, end of period	11.8
Employee Termination Charges
Restructuring Reserve [Roll Forward]
Balance, beginning of period	10.8
Expense, net	8.8
Cash payments, net	(17.3)
Non-cash adjustments/reclassifications	0.0
Balance, end of period	2.3
Impairment Charges
Restructuring Reserve [Roll Forward]
Balance, beginning of period	0.0
Expense, net	5.1
Cash payments, net	0.0
Non-cash adjustments/reclassifications	(5.1)
Balance, end of period	0.0
Transaction-Related Charges
Restructuring Reserve [Roll Forward]
Balance, beginning of period	1.5
Expense, net	3.4
Cash payments, net	(4.3)
Non-cash adjustments/reclassifications	0.0
Balance, end of period	0.6
Integration Costs
Restructuring Reserve [Roll Forward]
Balance, beginning of period	0.0
Expense, net	1.8
Cash payments, net	1.8
Non-cash adjustments/reclassifications	0.0
Balance, end of period	0.0
Other Restructuring Charges
Restructuring Reserve [Roll Forward]
Balance, beginning of period	49.8
Expense, net	4.0
Cash payments, net	(3.6)
Non-cash adjustments/reclassifications	(41.3)
Balance, end of period	$ 8.9

Quad/Graphics, Inc. 10-Q