| 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 and six months ended June 30, 2026 and June 30, 2025: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Foreign Currency Translation Gain (Loss) | | Net Actuarial Gain and Prior Service Cost | | Amortization of Gain on Interest Rate Swap | | Net Gain (Loss) on Marketable Securities Held in Trust | | Total | | Three Months Ended June 30, 2026 | | | | | | | | | | | Balance at March 31, 2026 | $ | (2,065.5) | | | $ | (29.7) | | | $ | 7.9 | | | $ | (3.9) | | | $ | (2,091.2) | | | Other comprehensive income (loss) | (71.8) | | | 0.2 | | | (0.1) | | | (1.2) | | | (72.9) | | | Tax (expense) benefit | (2.1) | | | (1.1) | | | — | | | 0.2 | | | (3.0) | | | Other comprehensive income (loss), net of tax | (73.9) | | | (0.9) | | | (0.1) | | | (1.0) | | | (75.9) | | | Other comprehensive income (loss) attributable to noncontrolling interest | 0.4 | | | — | | | — | | | — | | | 0.4 | | | Balance as of June 30, 2026 | $ | (2,139.0) | | | $ | (30.6) | | | $ | 7.8 | | | $ | (4.9) | | | $ | (2,166.7) | | | | | | | | | | | | | Three Months Ended June 30, 2025 | | | | | | | | | | | Balance at March 31, 2025 | $ | (2,313.8) | | | $ | (22.0) | | | $ | 8.0 | | | $ | (6.7) | | | $ | (2,334.5) | | | Other comprehensive income (loss) | 231.0 | | | 0.3 | | | — | | | 10.0 | | | 241.3 | | | Tax (expense) benefit | 8.8 | | | (1.2) | | | — | | | (2.3) | | | 5.3 | | | Other comprehensive income (loss), net of tax | 239.8 | | | (0.9) | | | — | | | 7.7 | | | 246.6 | | | Other comprehensive income (loss) attributable to noncontrolling interest | (1.2) | | | — | | | — | | | — | | | (1.2) | | | Balance as of June 30, 2025 | $ | (2,075.2) | | | $ | (22.9) | | | $ | 8.0 | | | $ | 1.0 | | | $ | (2,089.1) | | | | | | | | | | | | | Six Months Ended June 30, 2026 | | | | | | | | | | | Balance at December 31, 2025 | $ | (2,115.7) | | | $ | (24.8) | | | $ | 7.9 | | | $ | 0.7 | | | $ | (2,131.9) | | | Other comprehensive income (loss) | (20.9) | | | 0.5 | | | (0.1) | | | (7.2) | | | (27.7) | | | Tax (expense) benefit | (1.4) | | | (6.3) | | | — | | | 1.6 | | | (6.1) | | | Other comprehensive income (loss), net of tax | (22.3) | | | (5.8) | | | (0.1) | | | (5.6) | | | (33.8) | | | Other comprehensive income (loss) attributable to noncontrolling interest | (1.0) | | | — | | | — | | | — | | | (1.0) | | | Balance as of June 30, 2026 | $ | (2,139.0) | | | $ | (30.6) | | | $ | 7.8 | | | $ | (4.9) | | | $ | (2,166.7) | | | | | | | | | | | | | Six Months Ended June 30, 2025 | | | | | | | | | | | Balance at December 31, 2024 | $ | (2,420.3) | | | $ | (22.1) | | | $ | 8 | | | $ | (14.6) | | | $ | (2,449) | | | Other comprehensive income (loss) | 340.1 | | | 0.5 | | | — | | | 20.3 | | | 360.9 | | | Tax (expense) benefit | 7.8 | | | (1.3) | | | — | | | (4.7) | | | 1.8 | | | Other comprehensive income (loss), net of tax | 347.9 | | | (0.8) | | | — | | | 15.6 | | | 362.7 | | | Other comprehensive income (loss) attributable to noncontrolling interest | (2.8) | | | — | | | — | | | — | | | (2.8) | | | Balance as of June 30, 2025 | $ | (2,075.2) | | | $ | (22.9) | | | $ | 8.0 | | | $ | 1.0 | | | $ | (2,089.1) | |
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