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Employee Retirement Plans - Summary of Fair Value of Pension Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets $ 162.8 $ 190.2 $ 170.8
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 2.7 3.2 $ 3.2
Merchant Navy Officers Pension Fund      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 2.8 3.3  
Merchant Navy Officers Pension Fund | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 0.3 0.3  
Merchant Navy Officers Pension Fund | Liability Hedging Assets      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 1.6 1.9  
Merchant Navy Officers Pension Fund | Hedge Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 0.4 0.5  
Merchant Navy Officers Pension Fund | Corporate Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 0.4 0.5  
Merchant Navy Officers Pension Fund | Property      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 0.1 0.1  
Merchant Navy Officers Pension Fund | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 2.8 3.3  
Merchant Navy Officers Pension Fund | Level 3 | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 0.3 0.3  
Merchant Navy Officers Pension Fund | Level 3 | Liability Hedging Assets      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 1.6 1.9  
Merchant Navy Officers Pension Fund | Level 3 | Hedge Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 0.4 0.5  
Merchant Navy Officers Pension Fund | Level 3 | Corporate Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 0.4 0.5  
Merchant Navy Officers Pension Fund | Level 3 | Property      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 0.1 0.1  
Foreign Plan      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 160.0 186.8  
Foreign Plan | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 29.6 38.6  
Foreign Plan | Liability Hedging Assets      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 52.5 66.7  
Foreign Plan | Hedge Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 42.8 46.4  
Foreign Plan | Corporate Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 25.8 25.7  
Foreign Plan | Property      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 8.6 8.8  
Foreign Plan | Other      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 0.7 0.6  
Foreign Plan | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 0.4 0.2  
Foreign Plan | Level 1 | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 0.0 0.0  
Foreign Plan | Level 1 | Liability Hedging Assets      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 0.0 0.0  
Foreign Plan | Level 1 | Hedge Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 0.0 0.0  
Foreign Plan | Level 1 | Corporate Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 0.0 0.0  
Foreign Plan | Level 1 | Property      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 0.0 0.0  
Foreign Plan | Level 1 | Other      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 0.4 0.2  
Foreign Plan | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 159.6 186.6  
Foreign Plan | Level 2 | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 29.6 38.6  
Foreign Plan | Level 2 | Liability Hedging Assets      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 52.5 66.7  
Foreign Plan | Level 2 | Hedge Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 42.8 46.4  
Foreign Plan | Level 2 | Corporate Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 25.8 25.7  
Foreign Plan | Level 2 | Property      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 8.6 8.8  
Foreign Plan | Level 2 | Other      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets $ 0.3 $ 0.4