Share repurchase program (Details) - USD ($) $ / shares in Units, shares in Millions					1 Months Ended	3 Months Ended		6 Months Ended
	Feb. 22, 2024	Nov. 13, 2023	Nov. 09, 2023	Jun. 02, 2023	Dec. 31, 2023	Jun. 30, 2024	Sep. 30, 2023	Jun. 30, 2024
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Shares repurchased under share repurchase program (in shares)								10.8
Shares repurchased value under share repurchase program								$ 154,700,000
Treasury stock, value, acquired, cost method								154,700,000
Dividends								40,900,000
Return of capital to shareholders								$ 195,600,000
Number of shares repurchased (in shares)								10.8
300 Million First Accelerated Share Repurchase Program
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Shares approved to be repurchased under share repurchase program, amount (up to)				$ 300,000,000
Shares repurchased under share repurchase program (in shares)				15.2			3.1
Shares repurchased value under share repurchase program				$ 240,000,000
Treasury stock, value, acquired, cost method				$ 240,000,000
Stock repurchase program, percent repurchased				80.00%
Number of shares repurchased (in shares)				15.2			3.1
325 Million Second Accelerated Share Repurchase
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Shares approved to be repurchased under share repurchase program, amount (up to)			$ 325,000,000
Shares repurchased under share repurchase program (in shares)	4.0	17.3	17.3
Shares repurchased value under share repurchase program		$ 260,000,000
Treasury stock, value, acquired, cost method		$ 260,000,000
Stock repurchase program, percent repurchased		80.00%
Number of shares repurchased (in shares)	4.0	17.3	17.3
December2023 Share Repurchase Program
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Shares approved to be repurchased under share repurchase program, amount (up to)					$ 650,000,000
Shares repurchased under share repurchase program (in shares)						5.1		10.9
Shares repurchased value under share repurchase program						$ 71,300,000		$ 155,800,000
Treasury stock value acquired not yet have been paid								$ 1,100,000
Average price paid per share (in dollar per share)						$ 14.05		$ 14.29
Treasury stock, value, acquired, cost method						$ 71,300,000		$ 155,800,000
Share repurchase program expiration date					Dec. 31, 2025
Number of shares repurchased (in shares)						5.1		10.9