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6. Accumulated Other Comprehensive Income 6. Accumulated Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Accumulated other comprehensive income included in our condensed consolidated balance sheets consists of the following components (in millions):
Foreign currency translation adjustmentsForeign other post-employment benefits adjustmentsNet unrealized holding gains (losses) on available-for-sale investmentsTotal accumulated other comprehensive income (loss)
Balances as of January 1, 2023:$(466.5)$10.0 $(10.3)$(466.8)
Other comprehensive income, before reclassifications55.4 0.1 4.0 59.5 
Amounts reclassified from Accumulated other comprehensive income (loss)— (0.1)0.2 0.1 
Income tax effects(0.2)0.1 (1.0)(1.1)
Other comprehensive income, net of income taxes55.2 0.1 3.2 58.5 
Balances as of March 31, 2023:$(411.3)$10.1 $(7.1)$(408.3)
Foreign currency translation adjustmentsForeign other post-employment benefits adjustmentsNet unrealized holding gains (losses) on available-for-sale investmentsTotal accumulated other comprehensive income (loss)
Balances as of January 1, 2022:$(170.5)$(10.9)$5.8 $(175.6)
Other comprehensive income (loss), before reclassifications(128.7)0.4 (5.2)(133.5)
Income tax effects0.1 (0.1)1.2 1.2 
Other comprehensive income (loss), net of income taxes(128.6)0.3 (4.0)(132.3)
Balances as of March 31, 2022:$(299.1)$(10.6)$1.8 $(307.9)