Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net loss	$ (2.0)	$ (100.9)	$ (40.4)	$ (217.4)
Other comprehensive income (loss), net of tax
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	2.0	3.0	6.1	(19.1)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	0.4	0.4	(1.2)	(4.9)
Total interest rate hedges	1.6	2.6	4.9	(14.2)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	2.6	2.1	6.4	11.2
Other	0.0	0.0	(0.9)	(0.8)
Other comprehensive loss, net of tax	(23.5)	(5.7)	(30.5)	(66.1)
Comprehensive loss	(25.5)	(106.6)	(70.9)	(283.5)
Less: Comprehensive income (loss) attributable to noncontrolling interests	0.1	0.4	0.7	(0.9)
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	(25.6)	(107.0)	(71.6)	(282.6)
Translation adjustment
Other comprehensive income (loss), net of tax
Translation adjustment and foreign currency hedges	(28.3)	(10.0)	(41.8)	(64.1)
Net Investment Hedging [Member]
Other comprehensive income (loss), net of tax
Translation adjustment and foreign currency hedges	0.6	(0.4)	0.9	1.8
Foreign currency hedges, amount recognized in other comprehensive income, tax	(0.0)	0.1	(0.0)	(0.2)
Interest rate swaps
Other comprehensive income (loss), net of tax
Interest rate hedges, net gain recognized in other comprehensive income, tax	0.9	(0.9)	1.7	4.0
Pension and other post-retirement benefits
Other comprehensive income (loss), net of tax
Net actuarial loss amortization, tax	$ 0.5	$ 0.6	$ 1.4	$ 2.4