Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Narrative (Details)

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Commitments and Contingencies - Narrative (Details) - 3 months ended Dec. 31, 2018
£ in Millions, $ in Millions
USD ($)
GBP (£)
Commitments and Contingencies    
Loss Contingency, Damages Sought | £   £ 38.5
General claims and lawsuits | Minimum    
Commitments and Contingencies    
Deductibles and self-insured retentions per occurrence or per claim | $ $ 0.5