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Other, Net (Tables)
 12 Months Ended
Dec. 31, 2018
Other Income and Expenses [Abstract]  
Summary of other, net (income) expense
Other, net (income) expense consists of the following items:
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(in millions)
Foreign currency exchange transactions
$
0.9

 
$
—

 
$
(2.3
)
Gain on equity investments
(0.3
)
 
(0.2
)
 
(0.2
)
Pension
(4.3
)
 
(2.7
)
 
(1.3
)
Other
(0.2
)
 
2.2

 
(3.9
)
Other, net
$
(3.9
)
 
$
(0.7
)
 
$
(7.7
)