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Accumulated Other Comprehensive Income
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income
The changes in the components of Accumulated Other Comprehensive Income (“AOCI”), net of tax, are as follows (in millions):
 
Unrealized
Translation
 
Defined Benefit
Pension Plans
 
Cash Flow
Hedges
 
Accumulated
Other
Comprehensive
Income
Balance, December 31, 2017
$
(31.6
)
 
$
0.8

 
$
(0.5
)
 
$
(31.3
)
Other comprehensive income (loss)
(0.7
)
 
0.7

 
(0.8
)
 
(0.8
)
Balance, June 30, 2018
$
(32.3
)
 
$
1.5

 
$
(1.3
)
 
$
(32.1
)
The changes in the components of AOCI, including the tax effect, are as follows (in millions):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
Unrealized translation
$
(10.0
)
 
$
4.7

 
$
(0.7
)
 
$
14.5

Defined benefit pension plans
1.2

 
—

 
0.9

 
0.2

Tax effect
(0.2
)
 
—

 
(0.2
)
 
—

Defined benefit pension plans, net of tax
1.0

 
—

 
0.7

 
0.2

Cash flow hedges
(1.6
)
 
0.5

 
(1.0
)
 
1.4

Tax effect
0.3

 
(0.1
)
 
0.2

 
(0.3
)
Cash flow hedges, net of tax
(1.3
)
 
0.4

 
(0.8
)
 
1.1

Change in AOCI
$
(10.3
)
 
$
5.1

 
$
(0.8
)
 
$
15.8