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Accumulated Other Comprehenive Income (Loss)
 3 Months Ended
Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following table sets forth the changes in AOCI, net of tax, by component during the three months ended March 31, 2021 and March 31, 2020:
Foreign Currency Translation Gain (Loss)Net Actuarial Gain and Prior Service CostAmortization of Gain on Interest Rate SwapNet Gain (Loss) on Marketable Securities Held in TrustTotal
Three Months Ended March 31, 2021
Balance at December 31, 2020$(1,719.1)$(109.7)$3.7 $18.9 $(1,806.2)
Other comprehensive income (loss)(114.4)1.3 0.5 (17.8)(130.4)
Tax (expense) benefit8.3 2.5 — — 10.8 
Other comprehensive income (loss), net of tax(106.1)3.8 0.5 (17.8)(119.6)
Other comprehensive income (loss) attributable to noncontrolling interest2.3 — — — 2.3 
Balance as of March 31, 2021$(1,822.9)$(105.9)$4.2 $1.1 $(1,923.5)
Three Months Ended March 31, 2020
Balance at December 31, 2019$(1,476.8)$(129.6)$2.1 $6.1 $(1,598.2)
Other comprehensive income (loss)(595.9)9.7 0.5 8.0 (577.7)
Tax (expense) benefit(7.5)(7.9)— — (15.4)
Other comprehensive income (loss), net of tax(603.4)1.8 0.5 8.0 (593.1)
Other comprehensive income (loss) attributable to noncontrolling interest7.3 — — — 7.3 
Balance as of March 31, 2020$(2,072.9)$(127.8)$2.6 $14.1 $(2,184.0)