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Other, Net (Tables)
 6 Months Ended
Jun. 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
June 30,
 
Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
 
(in millions)
Foreign currency exchange transactions
$
1.3

 
$
(0.3
)
 
$
2.2

 
$
1.3

Gain on equity investments
(0.4
)
 
—

 
(0.3
)
 
—

Pension cost
(1.2
)
 
(0.6
)
 
(2.3
)
 
(1.3
)
Other
(0.4
)
 
0.8

 
(0.5
)
 
—

Other, net
$
(0.7
)
 
$
(0.1
)
 
$
(0.9
)
 
$
—