Basis of presentation (Details)	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($) $ / $	Dec. 31, 2019 USD ($) $ / $	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($) $ / $	Jun. 30, 2020 USD ($) segment $ / $	Jun. 30, 2019 USD ($) $ / $	Dec. 31, 2019 USD ($) $ / $	Mar. 31, 2020 USD ($)	[1]	Jan. 01, 2020 USD ($)	Mar. 31, 2019 USD ($)	[2]	Jan. 01, 2019 USD ($)	Dec. 31, 2018 $ / $
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of operating segments | segment					3
Net monetary assets	$ 1,675,100,000	$ 1,232,600,000			$ 1,675,100,000		$ 1,232,600,000
Cash and cash equivalents	531,300,000	311,000,000.0			531,300,000		311,000,000.0
Goodwill	1,114,000,000.0	784,600,000			1,114,000,000.0		784,600,000
Revenues	826,000,000.0			$ 914,000,000.0	1,698,800,000	$ 1,819,000,000.0
Provision for doubtful accounts	43,500,000	30,200,000			43,500,000		30,200,000
Restricted cash	171,500,000	158,000,000.0			171,500,000		158,000,000.0
Right-of-use assets, net	$ 329,800,000	$ 270,300,000			$ 329,800,000		$ 270,300,000
Cumulative effect of change in accounting principle								$ (1,700,000)			$ 0
Argentina, Pesos | Argentina
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percent of Consolidated Revenue					5.00%	6.00%
Rate decrease percent	15.00%	37.00%		12.00%	15.00%	12.00%	37.00%
Official exchange rate | $ / $	70.4	59.9		42.6	70.4	42.6	59.9							37.6
Net remeasurement loss					$ (3,500,000)	$ 3,400,000
Net monetary assets	$ 25,000,000.0				25,000,000.0
Cash and cash equivalents	21,100,000				21,100,000
Nonmonetary assets	149,200,000				149,200,000
Goodwill	99,800,000				99,800,000
Equity Securities	0				0
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting principle								$ (1,700,000)			$ 28,800,000
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use assets, net													$ 310,100,000
Lease liabilities													320,300,000
Accounting Standards Update 2018-02 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting principle													$ 28,800,000
Accounting Standards Update 2016-13 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting principle										$ 1,700,000
Internal Loss AR Rebuild
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Third-party expense					200,000		$ 4,500,000
Revenues			$ 4,000,000.0
Bank fees			300,000
Increase to bad debt expense		$ 6,400,000	$ 13,700,000		10,600,000
Provision for doubtful accounts	21,600,000				21,600,000
Accounts receivable	$ 25,000,000.0				$ 25,000,000.0
Percent of Accounts Receivable	86.00%				86.00%
FRANCE
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Goodwill	$ 86,700,000				$ 86,700,000
Percentage of Fair Value in Excess of Carrying Amount	8.00%				8.00%
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage of Fair Value in Excess of Carrying Amount	21.00%				21.00%
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage of Fair Value in Excess of Carrying Amount	199.00%				199.00%
Revolving Credit Facility
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash	$ 5,000,000.0				$ 5,000,000.0

[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.

[2] Effective January 1, 2019, we adopted the provisions of ASU 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. We recognized a cumulative effect adjustment to January 1, 2019 retained earnings as a result of adopting this standard. See Note 1 for further details.