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Properties (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Property, Plant and Equipment [Line Items]      
Net proceeds received   $ 19.7 $ 0.0
Pretax gain   $ 7.1 $ 0.0
Building and Land | United Kingdom      
Property, Plant and Equipment [Line Items]      
Net proceeds received $ 19.7    
Pretax gain $ 7.1