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Pension Plans - Schedule of Net Benefit Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Current service cost $ 0.0 $ 0.1 $ 0.1
Interest cost 8.4 11.1 10.4
Expected return on assets (14.5) (15.7) (16.7)
Curtailment gain 0.0 (1.8) 0.0
Settlement loss 0.0 0.8 0.0
Amortization of net actuarial loss 2.6 3.1 2.7
Amortization of prior service credit (0.4) (0.4) (0.5)
Total (credit) / charge for defined benefit plans (3.9) (2.8) (4.0)
Total charge for defined contribution plans 3.4 4.2 4.4
Total charge / (credit) for pension plans (0.5) 1.4 0.4
U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Current service cost 0.0 0.0 0.0
Interest cost 7.0 9.2 8.6
Expected return on assets (12.2) (13.4) (14.5)
Curtailment gain 0.0 0.0 0.0
Settlement loss 0.0 0.0 0.0
Amortization of net actuarial loss 2.3 2.5 2.3
Amortization of prior service credit (0.4) (0.4) (0.5)
Total (credit) / charge for defined benefit plans (3.3) (2.1) (4.1)
Total charge for defined contribution plans 1.5 2.1 2.1
Total charge / (credit) for pension plans (1.8) 0.0 (2.0)
U.S./ other      
Defined Benefit Plan Disclosure [Line Items]      
Current service cost 0.0 0.1 0.1
Interest cost 1.4 1.9 1.8
Expected return on assets (2.3) (2.3) (2.2)
Curtailment gain 0.0 (1.8) 0.0
Settlement loss 0.0 0.8 0.0
Amortization of net actuarial loss 0.3 0.6 0.4
Amortization of prior service credit 0.0 0.0 0.0
Total (credit) / charge for defined benefit plans (0.6) (0.7) 0.1
Total charge for defined contribution plans 1.9 2.1 2.3
Total charge / (credit) for pension plans $ 1.3 $ 1.4 $ 2.4