Goodwill and other intangibles - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Acquired Finite-Lived Intangible Assets [Line Items]
Tax-deductible goodwill	$ 128.9	$ 172.6
Amortization expense of other intangibles	33.0	19.2
Future amortization expense
Expected amortization expense in 2023	32.7
Expected amortization expense in 2024	30.1
Expected amortization expense in 2025	28.0
Expected amortization expense in 2026	20.3
Expected amortization expense in 2027	11.4
Title
Acquired Finite-Lived Intangible Assets [Line Items]
Other intangibles acquired	12.6	$ 211.6
Intangible assets, written off related to disposal of a business	$ 10.5