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Other Assets - Additional Information (Details)
ft² in Thousands, $ in Millions
3 Months Ended 9 Months Ended
May 12, 2017
ft²
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Real Estate [Line Items]          
Revenue   $ 185.8 $ 272.5 $ 594.8 $ 620.5
Proceeds from development project asset       38.9 36.9
Office Building [Member] | Ireland [Member]          
Real Estate [Line Items]          
Square feet of property sold | ft² 130        
Real Estate [Member]          
Real Estate [Line Items]          
Revenue   6.5 89.8 48.7 103.4
Cost of goods and services   $ 5.8 $ 63.4 45.6 $ 73.7
Real Estate [Member] | Office Building [Member] | Ireland [Member]          
Real Estate [Line Items]          
Revenue       25.0  
Cost of goods and services       $ 22.2