Derivatives and Financial Instruments - Fair Values of Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Revolving credit facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest bearing loans and borrowings:	$ 15.3	$ 17.2
Revolving credit facility \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest bearing loans and borrowings:	0.0	0.0
Revolving credit facility \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest bearing loans and borrowings:	15.3	17.2
Revolving credit facility \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest bearing loans and borrowings:	0.0	0.0
Bank overdraft
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest bearing loans and borrowings:		3.1
Bank overdraft \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest bearing loans and borrowings:		0.0
Bank overdraft \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest bearing loans and borrowings:		3.1
Bank overdraft \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest bearing loans and borrowings:		0.0
Loan Notes \| 4.94% Loan Notes due June 2026
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest bearing loans and borrowings:	25.0	25.0
Loan Notes \| 4.94% Loan Notes due June 2026 \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest bearing loans and borrowings:	0.0	0.0
Loan Notes \| 4.94% Loan Notes due June 2026 \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest bearing loans and borrowings:	25.0	25.0
Loan Notes \| 4.94% Loan Notes due June 2026 \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest bearing loans and borrowings:	0.0	0.0
Foreign currency contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract assets	0.3
Foreign currency contract liabilities		0.9
Foreign currency contract \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract assets	0.0
Foreign currency contract liabilities		0.0
Foreign currency contract \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract assets	0.3
Foreign currency contract liabilities		0.9
Foreign currency contract \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract assets	$ 0.0
Foreign currency contract liabilities		$ 0.0