Goodwill and Intangible Assets - Other Intangibles (Details) - USD ($) $ in Millions |
3 Months Ended | |||||
|---|---|---|---|---|---|---|
Sep. 30, 2022 |
Jun. 30, 2022 |
Mar. 31, 2022 |
Sep. 30, 2021 |
Jun. 30, 2021 |
Mar. 31, 2021 |
|
| Finite-lived Intangible Assets [Roll Forward] | ||||||
| Amortization | $ (111.1) | $ (112.0) | $ (115.8) | $ (122.6) | $ (122.9) | $ (122.4) |
| WWN relationship transfer | 0.0 | |||||
| Other indefinite-lived intangibles | ||||||
| Balance at beginning of period | 1,280.0 | 1,280.0 | 1,280.0 | 1,275.8 | 1,275.8 | 1,275.8 |
| Acquisition | 0.0 | 0.0 | ||||
| Additions at cost | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Other | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Balance at end of period | 1,280.0 | 1,280.0 | 1,280.0 | 1,275.8 | 1,275.8 | 1,275.8 |
| Total | ||||||
| Balance at beginning of period | 4,541.7 | 4,689.7 | 4,824.5 | 5,047.3 | 5,157.7 | 4,814.8 |
| Acquisition | (4.0) | 493.0 | ||||
| Additions at cost | 0.2 | 0.2 | 0.2 | 0.2 | 7.3 | 0.2 |
| Amortization | (111.1) | (112.0) | (115.8) | (122.6) | (122.9) | (122.4) |
| Other | (34.9) | (36.2) | (19.2) | (15.0) | 9.2 | (27.9) |
| Balance at end of period | 4,395.9 | 4,541.7 | 4,689.7 | 4,909.9 | 5,047.3 | 5,157.7 |
| Customer relationships | ||||||
| Finite-lived Intangible Assets [Roll Forward] | ||||||
| Balance at beginning of period | 1,657.4 | 1,726.7 | 1,793.3 | 1,887.9 | 1,947.9 | 1,912.9 |
| Acquisition | 106.0 | |||||
| Acquisitions | 2.0 | |||||
| Additions at cost | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Amortization | (59.4) | (59.7) | (61.9) | (64.3) | (64.5) | (65.6) |
| Other | (8.5) | (9.6) | (4.7) | (3.4) | 2.5 | (5.4) |
| Balance at end of period | 1,589.5 | 1,657.4 | 1,726.7 | 1,820.2 | 1,887.9 | 1,947.9 |
| Total | ||||||
| Amortization | (59.4) | (59.7) | (61.9) | (64.3) | (64.5) | (65.6) |
| Reacquired rights | ||||||
| Finite-lived Intangible Assets [Roll Forward] | ||||||
| Balance at beginning of period | 251.3 | 271.7 | 284.7 | 312.1 | 316.4 | 0.0 |
| Acquisition | 271.0 | |||||
| Acquisitions | (1.0) | |||||
| Additions at cost | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Amortization | (4.5) | (4.7) | (5.1) | (7.2) | (7.4) | (5.0) |
| WWN relationship transfer | 64.7 | |||||
| Other | (16.6) | (15.7) | (7.9) | (7.3) | 4.1 | (14.3) |
| Balance at end of period | 230.2 | 251.3 | 271.7 | 297.6 | 312.1 | 316.4 |
| Total | ||||||
| Amortization | (4.5) | (4.7) | (5.1) | (7.2) | (7.4) | (5.0) |
| Database | ||||||
| Finite-lived Intangible Assets [Roll Forward] | ||||||
| Balance at beginning of period | 1,186.8 | 1,235.9 | 1,285.1 | 1,381.7 | 1,431.3 | 1,369.4 |
| Acquisition | 116.0 | |||||
| Acquisitions | (5.0) | |||||
| Additions at cost | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Amortization | (43.0) | (43.2) | (44.6) | (46.9) | (47.0) | (47.8) |
| Other | (4.9) | (5.9) | (4.6) | (2.4) | 2.4 | (6.3) |
| Balance at end of period | 1,138.9 | 1,186.8 | 1,235.9 | 1,332.4 | 1,381.7 | 1,431.3 |
| Total | ||||||
| Amortization | (43.0) | (43.2) | (44.6) | (46.9) | (47.0) | (47.8) |
| Other intangibles | ||||||
| Finite-lived Intangible Assets [Roll Forward] | ||||||
| Balance at beginning of period | 166.2 | 175.4 | 181.4 | 189.8 | 186.3 | 256.7 |
| Acquisition | 0.0 | |||||
| Acquisitions | 0.0 | |||||
| Additions at cost | 0.2 | 0.2 | 0.2 | 0.2 | 7.3 | 0.2 |
| Amortization | (4.2) | (4.4) | (4.2) | (4.2) | (4.0) | (4.0) |
| WWN relationship transfer | (64.7) | |||||
| Other | (4.9) | (5.0) | (2.0) | (1.9) | 0.2 | (1.9) |
| Balance at end of period | 157.3 | 166.2 | 175.4 | 183.9 | 189.8 | 186.3 |
| Total | ||||||
| Amortization | $ (4.2) | $ (4.4) | $ (4.2) | $ (4.2) | $ (4.0) | $ (4.0) |