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Accumulated other comprehensive income or loss (Tables)
12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Schedule of changes in components of AOCI
The following table presents changes in the components of AOCI:
(in millions)
Foreign currency translation
 
Derivative instruments
 
Defined benefit plans
 
Total
Balance on December 31, 2016
$
(47.3
)
 
$

 
$
3.2

 
$
(44.1
)
Unrealized gain
71.0

 
0.3

 
2.2

 
73.5

Reclassification of loss (gain) into earnings

 
0.1

 
(3.2
)
 
(3.1
)
(Decrease) increase due to income taxes

 
(0.1
)
 
0.2

 
0.1

Balance on December 31, 2017
23.7

 
0.3

 
2.4

 
26.4

Unrealized (loss) gain
(82.7
)
 
3.0

 
(16.9
)
 
(96.6
)
Reclassification of (gain) loss into earnings

 
(1.9
)
 
2.3

 
0.4

(Decrease) increase due to income taxes

 
(0.3
)
 
3.6

 
3.3

Balance on December 31, 2018
(59.0
)
 
1.1

 
(8.6
)
 
(66.5
)
Unrealized loss
(3.3
)
 
(1.4
)
 
(18.9
)
 
(23.6
)
Reclassification of gain into earnings

 
(0.9
)
 
(0.6
)
 
(1.5
)
Increase due to income taxes

 
0.7

 
5.0

 
5.7

Balance on December 31, 2019
$
(62.3
)
 
$
(0.5
)
 
$
(23.1
)
 
$
(85.9
)