| Segment Reporting [Table Text Block] |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended June 30, 2026 | | | Dx | | BLS | | Intercompany eliminations and other | | LHI | | Revenues: | | | | | | | | | | Revenues | | $ | 2,900.7 | | | $ | 836.2 | | | $ | (5.8) | | | $ | 3,731.1 | | | | | | | | | | | | Operating Earnings: | | | | | | | | | | Labor | | 1,223.4 | | | 313.2 | | | | | | | Supplies | | 625.1 | | | 130.8 | | | | | | | Shipping costs | | | | 121.8 | | | | | | | Depreciation | | 68.1 | | | 27.7 | | | | | | | Other operating expenses | | 461.5 | | | 100.5 | | | | | | | Segment operating income | | $ | 522.6 | | | $ | 142.2 | | | | | $ | 664.8 | | | General corporate and unallocated expenses | | | | | | | | (130.0) | | | Amortization of intangibles and other assets | | | | | | | | (78.1) | | | Restructuring and other charges | | | | | | | | (5.1) | | | | | | | | | | | Total Operating income | | | | | | | | 451.6 | | Other (expense) income: | | | | | | | | | | Interest expense | | | | | | | | (61.1) | | | Investment income | | | | | | | | 5.6 | | | Equity method loss, net | | | | | | | | (6.2) | | | Other, net | | | | | | | | (3.5) | | | Earnings from operations before income taxes | | | | | | | | $ | 386.4 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended June 30, 2025 | | | Dx | | BLS | | Intercompany eliminations and other | | LHI | | Revenues: | | | | | | | | | | Revenues | | $ | 2,748.8 | | | $ | 784.8 | | | $ | (6.3) | | | $ | 3,527.3 | | | | | | | | | | | | Operating Earnings: | | | | | | | | | | Labor | | 1,155.1 | | | 302.3 | | | | | | | Supplies | | 591.3 | | | 130.8 | | | | | | | Shipping costs | | | | 98.2 | | | | | | | Depreciation | | 65.4 | | | 29.0 | | | | | | | Other operating expenses | | 454.2 | | | 101.2 | | | | | | | Segment operating income | | $ | 482.8 | | | $ | 123.3 | | | | | $ | 606.1 | | | General corporate and unallocated expenses | | | | | | | | (139.2) | | | Amortization of intangibles and other assets | | | | | | | | (68.3) | | | Restructuring and other charges | | | | | | | | (4.1) | | | | | | | | | | | | Total Operating income | | | | | | | | 394.5 | | Other (expense) income: | | | | | | | | | | Interest expense | | | | | | | | (57.1) | | | Investment income | | | | | | | | 1.7 | | | Equity method loss, net | | | | | | | | (1.7) | | | Other, net | | | | | | | | (32.7) | | | Earnings from operations before income taxes | | | | | | | | $ | 304.7 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Six Months Ended June 30, 2026 | | | Dx | | BLS | | Intercompany eliminations and other | | LHI | | Revenues: | | | | | | | | | | Revenues | | $ | 5,662.8 | | | $ | 1,616.8 | | | $ | (10.9) | | | $ | 7,268.7 | | | | | | | | | | | | Operating Earnings: | | | | | | | | | | Labor | | 2,411.5 | | | 622.5 | | | | | | | Supplies | | 1,238.6 | | | 252.3 | | | | | | | Shipping costs | | | | 232.6 | | | | | | | Depreciation | | 131.9 | | | 56.3 | | | | | | | Other operating expenses | | 899.5 | | | 190.2 | | | | | | | Segment operating income | | $ | 981.3 | | | $ | 262.9 | | | | | $ | 1,244.2 | | | General corporate and unallocated expenses | | | | | | | | (246.6) | | | Amortization of intangibles and other assets | | | | | | | | (153.7) | | | Restructuring and other charges | | | | | | | | (11.5) | | | | | | | | | | | | Total Operating income | | | | | | | | 832.4 | | | Other (expense) income: | | | | | | | | | | Interest expense | | | | | | | | (116.2) | | | Investment income | | | | | | | | 17.8 | | | Equity method loss, net | | | | | | | | (11.3) | | | Other, net | | | | | | | | (16.6) | | | Earnings from operations before income taxes | | | | | | | | $ | 706.1 | | | | | | | | | | | | | Six Months Ended June 30, 2025 | | | Dx | | BLS | | Intercompany eliminations and other | | LHI | | Revenues: | | | | | | | | | | Revenues | | $ | 5,378.4 | | | $ | 1,506.1 | | | $ | (12.1) | | | $ | 6,872.4 | | | | | | | | | | | | Operating Earnings: | | | | | | | | | | Labor | | 2,278.7 | | | 592.0 | | | | | | | Supplies | | 1,177.9 | | | 241.9 | | | | | | | Shipping costs | | | | 193.2 | | | | | | | Depreciation | | 127.1 | | | 57.6 | | | | | | | Other operating expenses | | 884.4 | | | 191.2 | | | | | | | Segment operating income | | $ | 910.3 | | | $ | 230.2 | | | | | $ | 1,140.5 | | | General corporate and unallocated expenses | | | | | | | | (271.6) | | | Amortization of intangibles and other assets | | | | | | | | (137.9) | | | Restructuring and other charges | | | | | | | | (10.5) | | | | | | | | | | | | Total Operating income | | | | | | | | 720.5 | | | Other (expense) income: | | | | | | | | | | Interest expense | | | | | | | | (113.1) | | | Investment income | | | | | | | | 8.2 | | | Equity method loss, net | | | | | | | | (2.0) | | | Other, net | | | | | | | | (33.7) | | | Earnings from operations before income taxes | | | | | | | | $ | 579.9 | |
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