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Pension Plans - Schedule of Net Benefit Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 0.0 $ 0.0 $ 0.1
Interest cost 6.7 8.4 11.1
Expected return on assets (12.0) (14.5) (15.7)
Curtailment gain 0.0 0.0 (1.8)
Settlement loss 0.0 0.0 0.8
Amortization of net actuarial loss 3.8 2.6 3.1
Amortization of prior service credit (0.4) (0.4) (0.4)
Total credit for defined benefit plans (1.9) (3.9) (2.8)
Total charge for defined contribution plans 3.6 3.4 4.2
Total charge / (credit) for benefit plans 1.7 (0.5) 1.4
U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0.0 0.0 0.0
Interest cost 5.6 7.0 9.2
Expected return on assets (10.2) (12.2) (13.4)
Curtailment gain 0.0 0.0 0.0
Settlement loss 0.0 0.0 0.0
Amortization of net actuarial loss 3.4 2.3 2.5
Amortization of prior service credit (0.4) (0.4) (0.4)
Total credit for defined benefit plans (1.6) (3.3) (2.1)
Total charge for defined contribution plans 2.1 1.5 2.1
Total charge / (credit) for benefit plans 0.5 (1.8) 0.0
U.S. / other      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0.0 0.0 0.1
Interest cost 1.1 1.4 1.9
Expected return on assets (1.8) (2.3) (2.3)
Curtailment gain 0.0 0.0 (1.8)
Settlement loss 0.0 0.0 0.8
Amortization of net actuarial loss 0.4 0.3 0.6
Amortization of prior service credit 0.0 0.0 0.0
Total credit for defined benefit plans (0.3) (0.6) (0.7)
Total charge for defined contribution plans 1.5 1.9 2.1
Total charge / (credit) for benefit plans $ 1.2 $ 1.3 $ 1.4