| 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 nine months ended September 30, 2026 and September 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 September 30, 2026 | | | | | | | | | | | Balance at June 30, 2026 | $ | (2,139.0) | | | $ | (30.6) | | | $ | 7.8 | | | $ | (4.9) | | | $ | (2,166.7) | | | Other comprehensive income (loss) | (13.1) | | | 1.3 | | | — | | | (25.6) | | | (37.4) | | | Tax (expense) benefit | (0.8) | | | (0.6) | | | — | | | 5.2 | | | 3.8 | | | Other comprehensive income (loss), net of tax | (13.9) | | | 0.7 | | | — | | | (20.4) | | | (33.6) | | | Other comprehensive income (loss) attributable to noncontrolling interest | 0.1 | | | — | | | — | | | — | | | 0.1 | | | Balance as of September 30, 2026 | $ | (2,152.8) | | | $ | (29.9) | | | $ | 7.8 | | | $ | (25.3) | | | $ | (2,200.2) | | | | | | | | | | | | | Three Months Ended September 30, 2025 | | | | | | | | | | | Balance at June 30, 2025 | $ | (2,075.2) | | | $ | (22.9) | | | $ | 8.0 | | | $ | 1.0 | | | $ | (2,089.1) | | | Other comprehensive income (loss) | (4.8) | | | 0.3 | | | (0.1) | | | 7.5 | | | 2.9 | | | Tax (expense) benefit | — | | | (2.0) | | | — | | | (1.7) | | | (3.7) | | | Other comprehensive income (loss), net of tax | (4.8) | | | (1.7) | | | (0.1) | | | 5.8 | | | (0.8) | | | Other comprehensive income (loss) attributable to noncontrolling interest | (0.7) | | | — | | | — | | | — | | | (0.7) | | | Balance as of September 30, 2025 | $ | (2,080.7) | | | $ | (24.6) | | | $ | 7.9 | | | $ | 6.8 | | | $ | (2,090.6) | | | | | | | | | | | | | Nine Months Ended September 30, 2026 | | | | | | | | | | | Balance at December 31, 2025 | $ | (2,115.7) | | | $ | (24.8) | | | $ | 7.9 | | | $ | 0.7 | | | $ | (2,131.9) | | | Other comprehensive income (loss) | (34.0) | | | 1.8 | | | (0.1) | | | (32.8) | | | (65.1) | | | Tax (expense) benefit | (2.2) | | | (6.9) | | | — | | | 6.8 | | | (2.3) | | | Other comprehensive income (loss), net of tax | (36.2) | | | (5.1) | | | (0.1) | | | (26.0) | | | (67.4) | | | Other comprehensive income (loss) attributable to noncontrolling interest | (0.9) | | | — | | | — | | | — | | | (0.9) | | | Balance as of September 30, 2026 | $ | (2,152.8) | | | $ | (29.9) | | | $ | 7.8 | | | $ | (25.3) | | | $ | (2,200.2) | | | | | | | | | | | | | Nine Months Ended September 30, 2025 | | | | | | | | | | | Balance at December 31, 2024 | $ | (2,420.3) | | | $ | (22.1) | | | $ | 8.0 | | | $ | (14.6) | | | $ | (2,449.0) | | | Other comprehensive income (loss) | 335.3 | | | 0.8 | | | (0.1) | | | 27.8 | | | 363.8 | | | Tax (expense) benefit | 7.8 | | | (3.3) | | | — | | | (6.4) | | | (1.9) | | | Other comprehensive income (loss), net of tax | 343.1 | | | (2.5) | | | (0.1) | | | 21.4 | | | 361.9 | | | Other comprehensive income (loss) attributable to noncontrolling interest | (3.5) | | | — | | | — | | | — | | | (3.5) | | | Balance as of September 30, 2025 | $ | (2,080.7) | | | $ | (24.6) | | | $ | 7.9 | | | $ | 6.8 | | | $ | (2,090.6) | |
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