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Income taxes - Additional Information (Detail) - USD ($) $ in Millions			3 Months Ended		12 Months Ended
	Apr. 01, 2020	Apr. 01, 2017	Sep. 30, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Tax Credit Carryforward [Line Items]
Income tax benefit, due to Tax Cuts and Jobs Act					$ 50.4
Income tax benefit, due to Tax Cuts and Jobs Act, received in 2017					9.1
Income tax benefit, due to Tax Cuts and Jobs Act, receivable in 2018					7.2
Income tax benefit, due to Tax Cuts and Jobs Act, receivable between 2019-2022					34.1
Rate change in the company's income tax provision					(0.4)	$ 3.5	$ 9.1
U.S. Federal tax loss carryforwards					319.5
State and local tax loss carryforwards					250.7
Foreign tax loss carryforwards					267.4
Total tax loss carryforwards					837.6	889.6
Tax credit carryforwards					127.0
Unrecognized Deferred Income Tax Liability, Tax Cuts and Jobs Act					21.5
Cash paid, net of refunds					34.3	46.4	59.7
Penalties and interest accrued related to income tax liabilities					2.3	1.2
Utilization of tax attributes, annual limitation					70.6
Utilization of tax attributes, cumulative limitation					$ 416.0
Minimum
Tax Credit Carryforward [Line Items]
Expected change in ownership percentage					50.00%
2018
Tax Credit Carryforward [Line Items]
Tax loss carryforwards, set to expire					$ 5.3
Tax credit carryforwards, set to expire					10.1
2019
Tax Credit Carryforward [Line Items]
Tax loss carryforwards, set to expire					7.3
Tax credit carryforwards, set to expire					10.2
2020
Tax Credit Carryforward [Line Items]
Tax loss carryforwards, set to expire					28.5
Tax credit carryforwards, set to expire					20.9
2021
Tax Credit Carryforward [Line Items]
Tax loss carryforwards, set to expire					14.5
Tax credit carryforwards, set to expire					8.7
2022
Tax Credit Carryforward [Line Items]
Tax loss carryforwards, set to expire					114.0
Tax credit carryforwards, set to expire					7.7
Thereafter
Tax Credit Carryforward [Line Items]
Tax loss carryforwards, set to expire					668.0
Tax credit carryforwards, set to expire					$ 69.4
United Kingdom
Tax Credit Carryforward [Line Items]
Rate change in the company's income tax provision						$ 3.5	$ 9.1
Income tax rate		18.00%	18.00%	20.00%
United Kingdom | Scenario, Forecast
Tax Credit Carryforward [Line Items]
Income tax rate	17.00%
India
Tax Credit Carryforward [Line Items]
Tax audit for the years					2006
Brazil
Tax Credit Carryforward [Line Items]
Tax audit for the years					2010

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