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Accumulated Other Comprehensive Income
 12 Months Ended
Dec. 31, 2017
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
 
Cash Flow
Hedges
 
Defined Benefit
Pension Plans
 
Accumulated Other Comprehensive Income
Balance, December 31, 2014
$
(18.3
)
 
$
(0.5
)
 
$
(0.3
)
 
$
(19.1
)
Other comprehensive loss
(22.1
)
 
(0.7
)
 
(1.3
)
 
(24.1
)
Balance, December 31, 2015
(40.4
)
 
(1.2
)
 
(1.6
)
 
(43.2
)
Other comprehensive (loss) income
(8.3
)
 
0.8

 
0.6

 
(6.9
)
Balance, December 31, 2016
(48.7
)
 
(0.4
)
 
(1.0
)
 
(50.1
)
Other comprehensive (loss) income
17.1

 
1.2

 
0.5

 
18.8

Balance, December 31, 2017
$
(31.6
)
 
$
0.8

 
$
(0.5
)
 
$
(31.3
)
The net changes in the components of AOCI, including the tax effect, are as follows (in millions):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Unrealized translation
$
17.1

 
$
(8.3
)
 
$
(22.1
)
 
 
 
 
 
 
Defined benefit pension plans
0.6

 
0.7

 
(1.9
)
Tax effect
(0.1
)
 
(0.1
)
 
0.6

Defined benefit pension plans, net of tax
0.5

 
0.6

 
(1.3
)
 
 
 
 
 
 
Cash flow hedges
1.5

 
1.0

 
(1.0
)
Tax effect
(0.3
)
 
(0.2
)
 
0.3

Cash flow hedges, net of tax
1.2

 
0.8

 
(0.7
)
 
 
 
 
 
 
Change in AOCI
$
18.8

 
$
(6.9
)
 
$
(24.1
)