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Accumulated Other Comprehensive Income (Loss) (Tables)
9 Months Ended
Sep. 30, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
MCBC stockholders' equity
Foreign
currency
translation
adjustments
Gain (loss) on
derivative instruments
Pension and
postretirement
benefit
adjustments
Equity method
investments
Accumulated
other
comprehensive
income (loss)
(In millions)
As of December 31, 2024$(1,087.0)$83.6 $(342.4)$(16.6)$(1,362.4)
Foreign currency translation adjustments325.5 — — — 325.5 
Gain (loss) recognized on net investment hedges(109.9)— — — (109.9)
Unrealized gain (loss) recognized on derivative instruments— (31.0)— — (31.0)
Derivative instrument activity reclassified from other comprehensive income (loss)— (0.5)— — (0.5)
Pension and other postretirement activity reclassified from other comprehensive income (loss)— — (5.7)— (5.7)
Ownership share of unconsolidated subsidiaries' other comprehensive income (loss)— — — 0.3 0.3 
Tax benefit (expense)29.5 7.9 1.3 (0.1)38.6 
As of September 30, 2025$(841.9)$60.0 $(346.8)$(16.4)$(1,145.1)