Acquisitions and Divestitures (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2015	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired					$ 5.9	$ 5.6	$ 884.6
Gain (Loss) on Disposition of Assets					6.7	(1.0)	(0.3)
Cost of sales
Income tax (benefit) expense							93.9
Income (loss) from discontinued operations, net of tax							143.7
Income from discontinued operations, net of tax					0.0	0.0	143.7
Impairment of assets	$ 134.4	$ 83.1			$ 217.5	3.1	9.8
Legacy Diebold United Kingdom [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses						5.0
Legacy Diebold United Kingdom And Electronic Security Business in Mexico [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Disposition of Assets						2.2
NA Electronic Security [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses				$ 350.0
Divestiture Agreed Upon Contingent Payment					10.00%
Services and software							16.3
Systems							8.5
Net sales							24.8
Cost of sales
Services and software							15.1
Systems							6.9
Cost of sales							22.0
Gross profit							2.8
Selling and administrative expense							4.8
Income (loss) from discontinued operations before taxes							(2.0)
Income tax (benefit) expense							(0.7)
Gain (loss) on sale of discontinued operations before taxes					$ 239.5		239.5
Income tax (benefit) expense							94.5
Gain (loss) on sale of discontinued operations, net of tax							145.0
Income (loss) from discontinued operations, net of tax							(1.3)
Income from discontinued operations, net of tax							$ 143.7
Diebold Nixdorf AG China Subsidiaries [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired			$ 5.8
Moxx and Visio [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired						$ 5.6