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Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Other Intangible Assets
The following table summarizes the other intangible assets movement year on year:
 
 
 
Three Months Ended

March 31
 
(in millions)
 
2019
 
 
2018
 
Gross cost at January 1
 
$
294.6
 
 
$
295.8
 
Internally developed software
 
 
0.5
 
 
 
0.8
 
Exchange effect
 
 
(0.8
)
 
 
1.2
 
Gross cost at March 31
 
 
294.3
 
 
 
297.8
 
Accumulated amortization at January 1
 
 
(158.3
)
 
 
(132.5
)
Amortization expense
 
 
(5.7
)
 
 
(6.7
)
Exchange effect
 
 
0.1
 
 
 
(0.3
)
Accumulated amortization at March 31
 
 
(163.9
)
 
 
(139.5
)
Net book amount at March 31
 
$
130.4
 
 
$
158.3
 
Schedule of Amortization Expense
Amortization expense
 
 
 
Three Months Ended

March 31
 
(in millions)
 
2019
 
 
2018
 
Product rights
 
$
(0.9
)
 
$
(0.9
)
Brand names
 
 
(0.2
)
 
 
(0.3
)
Technology
 
 
(0.8
)
 
 
(0.9
)
Customer relationships
 
 
(2.6
)
 
 
(2.6
)
Internally developed software
 
 
(1.2
)
 
 
(2.0
)
Total
 
$
(5.7
)
 
$
(6.7
)