| Comprehensive Income (Loss) Note [Text Block] |
Accumulated Other Comprehensive Income (Loss) (“AOCI”)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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