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Other, Net (Tables)
 9 Months Ended
Sep. 30, 2018
Other Income and Expenses [Abstract]  
Summary of other, net (income) expense
Other, net (income) expense consists of the following items:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
 
(in millions)
Foreign currency exchange transactions
$
0.3

 
$
(0.6
)
 
$
2.5

 
$
0.7

Gain on equity investments
(0.1
)
 
(0.2
)
 
(0.4
)
 
(0.2
)
Pension cost
(1.0
)
 
(0.6
)
 
(3.3
)
 
(1.9
)
Other
0.3

 
2.5

 
(0.2
)
 
2.5

Other, net
$
(0.5
)
 
$
1.1

 
$
(1.4
)
 
$
1.1