Basis of presentation (Details) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) reporting_unit segment $ / $	Mar. 31, 2020 USD ($) $ / $	Dec. 31, 2020 USD ($) reporting_unit $ / $	Dec. 31, 2019 USD ($) reporting_unit $ / $		Jan. 01, 2021 USD ($)	Jan. 01, 2020 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of operating segments | segment	4
Net monetary assets	$ 1,776.7		$ 1,814.8
Cash and cash equivalents	598.1		620.9
Goodwill	1,301.5		1,219.2
Provision for doubtful accounts	$ 35.0		$ 30.7
Number of Reporting Units | reporting_unit	4		9	8
Restricted cash	$ 274.2		$ 322.0
Cumulative effect of change in accounting principle	$ 225.1	$ 82.0	202.5	$ 207.6
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting principle			$ 0.5	$ (1.7)	[1]
Argentina, Pesos | Argentina
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percent of Consolidated Revenue	4.00%	5.00%
Rate decrease percent	8.00%	7.00%	29.00%
Official exchange rate | $ / $	91.7	64.5	84.0	59.9
Net remeasurement loss	$ (3.0)	$ 1.6
Net monetary assets	37.8		$ 31.3
Cash and cash equivalents	30.5		24.4
Nonmonetary assets	146.7		146.2
Goodwill	99.8		99.8
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting principle	413.3	449.9	407.5	$ 457.4
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting principle			0.5	$ (1.7)	[1]
Accounting Standards Update 2016-13 | Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting principle							$ 1.7
Accounting Standards Update 2019-12 | Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting principle						$ 0.5
Internal Loss AR Rebuild
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Third-party expense		0.2
Increase (decrease) to bad debt expense	1.6	$ 9.4
Legal Fees	0.8
Provision for doubtful accounts	11.0
Accounts receivable	$ 11.9
Percent of Accounts Receivable	92.00%
Revolving Credit Facility
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash	$ 6.1		$ 5.0

[1] Effective January 1, 2020, we adopted the provisions of ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. We recognized a cumulative effect adjustment to January 1, 2020 retained earnings as a result of adopting this standard. See Note 1 for further details.