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Fair value of financial instruments (Tables)
 3 Months Ended
Mar. 31, 2024
Fair Value Disclosures [Abstract]  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments
The fair value and carrying value of our material fixed-rate debt, excluding any unamortized debt issuance costs, are as follows:
(In millions) March 31, 2024December 31, 2023
$600 million senior unsecured notes  
Carrying value$600.0 600.0 
Fair value552.6 554.6 
$400 million senior unsecured notes  
Carrying value400.0 400.0 
Fair value386.2 382.0 
Derivatives Not Designated as Hedging Instruments
Amounts under these contracts were recognized in other operating income (expense) as follows:
Three Months
Ended March 31,
(in millions)20242023
Derivative instrument gains included in other operating income (expense)$13.4 8.2 
.
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location
In the first quarter of 2023, amounts under this contract were recognized in other operating income (expense) to offset transaction gains or losses and in interest expense as follows:
Three Months
Ended March 31,
(In millions)20242023
Derivative instrument losses included in other operating income (expense)$— (3.4)
Offsetting transaction gains — 3.4 
Derivative instrument losses included in interest expense— (0.3)
  Net derivative instrument losses— (3.7)
Schedule of Interest Rate Derivatives
The effect of the interest rate swaps and the amortization of the spot-forward difference on the net investment hedges cross currency swaps is included in interest expense as follows:
Three Months
Ended March 31,
(In millions) 20242023
Interest rate swaps designated as cash flow hedges(5.0)(4.0)
Cross currency swaps designated as net investment hedges(1.1)(1.4)
  Net derivative instrument gains included in interest expense(6.1)(5.4)