Redeemable Noncontrolling Interests (Details) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	May 13, 2019 € / shares	Feb. 17, 2017 € / shares
Redeemable Noncontrolling Interest [Line Items]
Balance at January 1	$ 20.9	$ 130.4	$ 492.1
Other comprehensive income	0.0	(1.7)	(19.3)
Redemption value adjustment	(1.7)	(18.6)	2.8
Redemption of shares	0.0	(89.2)	(345.2)
Reclassification of noncontrolling interest				$ 386.7
Balance at December 31	19.2	20.9	$ 130.4	$ 492.1
Diebold Nixdorf AG | Domination and Profit and Loss Transfer Agreement [Member]
Redeemable Noncontrolling Interest [Line Items]
Balance at January 1	$ 99.1
Balance at December 31		$ 99.1
Business Acquisition, Number Of Ordinary Shares Tendered | shares	29.8
Business Acquisition, Percentage Tendered Of Ordinary Shares Issued	100.00%
Business Acquisition, Share Price | € / shares					€ 54.80	€ 55.02
Recurring Cash Compensation Per Share Net Of Tax | € / shares						€ 2.82