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Pension Plans - Schedule of Net Benefit Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Current service cost $ 0.1 $ 0.1 $ 0.4
Interest cost 10.4 10.8 13.4
Expected return on assets (16.7) (16.6) (16.4)
Settlement loss 0.0 0.0 4.3
Amortization of net actuarial loss 2.7 2.8 2.3
Amortization of prior service credit (0.5) (0.5) (0.5)
Total (credit) / charge for defined benefit plans (4.0) (3.4) 3.5
Total charge for defined contribution plans 4.4 4.0 3.7
Total (credit) / charge for pension plans 0.4 0.6 7.2
U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Current service cost 0.0 0.0 0.3
Interest cost 8.6 8.9 10.9
Expected return on assets (14.5) (14.8) (14.1)
Settlement loss 0.0 0.0 0.0
Amortization of net actuarial loss 2.3 2.5 1.9
Amortization of prior service credit (0.5) (0.5) (0.5)
Total (credit) / charge for defined benefit plans (4.1) (3.9) (1.5)
Total charge for defined contribution plans 2.1 1.9 1.6
Total (credit) / charge for pension plans (2.0) (2.0) 0.1
U.S./ other      
Defined Benefit Plan Disclosure [Line Items]      
Current service cost 0.1 0.1 0.1
Interest cost 1.8 1.9 2.5
Expected return on assets (2.2) (1.8) (2.3)
Settlement loss 0.0 0.0 4.3
Amortization of net actuarial loss 0.4 0.3 0.4
Amortization of prior service credit 0.0 0.0 0.0
Total (credit) / charge for defined benefit plans 0.1 0.5 5.0
Total charge for defined contribution plans 2.3 2.1 2.1
Total (credit) / charge for pension plans $ 2.4 $ 2.6 $ 7.1