Accumulated other comprehensive income or loss

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

Accumulated other comprehensive income or loss

10.    Accumulated other comprehensive income or loss

The following table presents changes in the components of AOCI:

(in millions)	Foreign currency translation		Derivative instruments		Defined benefit plans		Total
Balance at December 31, 2020	$	51.8	$	(1.0)	$	(29.1)	$	21.7
Unrealized (loss) gain	(33.5)		(0.9)		0.6		(33.8)
Reclassification of loss into earnings	—		0.7		—		0.7
Income tax effect	(4.7)		—		—		(4.7)
Balance at March 31, 2021	$	13.6	$	(1.2)	$	(28.5)	$	(16.1)
Balance at December 31, 2019	$	(62.3)	$	(0.5)	$	(23.1)	$	(85.9)
Unrealized (loss) gain	(68.8)		1.6		0.4		(66.8)
Reclassification of gain into earnings	—		(0.1)		(0.1)		(0.2)
Income tax effect	—		(0.4)		—		(0.4)
Balance at March 31, 2020	$	(131.1)	$	0.6	$	(22.8)	$	(153.3)

The reclassifications and income tax effects shown above were immaterial to the financial statements. The reclassifications were made to either cost of sales or SG&A expenses depending upon the nature of the underlying transaction. The income tax effects in the three months ended March 31, 2021 on foreign currency translation were due to our net investment hedge discussed in note 14.