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Accumulated other comprehensive income or loss (Tables)
12 Months Ended
Dec. 31, 2020
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 instrumentsDefined benefit plansTotal
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) gain(3.3)(1.4)(18.9)(23.6)
Reclassification of (gain) loss into earnings— (0.9)(0.6)(1.5)
Increase due to income taxes— 0.7 5.0 5.7 
Balance at December 31, 2019(62.3)(0.5)(23.1)(85.9)
Unrealized gain (loss)106.4 1.0 (8.3)99.1 
Reclassification of (gain) loss into earnings— (1.7)0.6 (1.1)
Increase due to income taxes7.7 0.2 1.7 9.6 
Balance on December 31, 2020$51.8 $(1.0)$(29.1)$21.7