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Long-term debt - Senior Unsecured Notes (Details) - USD ($) $ in Millions	Aug. 07, 2020	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Debt issuance costs, current, net		$ 2.0	$ 2.0
Debt issuance costs		1.6	3.5
Long-term debt		$ 849.6	$ 885.5
3.875% Senior Unsecured Notes due 2028 \| Prior to August 15, 2023
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage	100.00%
3.875% Senior Unsecured Notes due 2028 \| Prior to August 15, 2023 \| Maximum
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage	40.00%
3.875% Senior Unsecured Notes due 2028 \| Upon the occurrence of a change in control \| Maximum
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage	101.00%
3.875% Senior Unsecured Notes due 2028 \| Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	3.875%	3.875%	3.875%
Long-term debt	$ 450.0	$ 450.0	$ 450.0