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Goodwill (Tables)
 3 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Goodwill
The following table summarizes goodwill at the balance sheet dates:
 
(in millions)
 
Total
 
At December 31, 2018
 
 
 
 
Gross cost
(1)
 
$
601.4
 
Accumulated impairment losses
 
 
(236.5
)
Net book amount
 
$
364.9
 
Exchange effect
 
 
(1.8
)
At March 31, 2019
 
 
 
 
Gross cost
(1)
 
$
599.6
 
Accumulated impairment losses
 
 
(236.5
)
Net book amount
 
$
363.1
 
 
(1)
 
Gross cost for 2019 and 2018 is net of $
298.5
 million of historical accumulated amortization.