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Shareholders Equity (Tables) | 3 Months Ended
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Mar. 31, 2021
Shareholders' Equity [Abstract] |
Schedule Of Activity In Our Various Shareholders Equity [Table Text Block] | Activity in our various shareholders' equity accounts for the three months ended March 31, 2021 and 2020 were as follows (in millions, except per share amounts):
| Shares |  | Par Value |  | Additional Paid-in Capital |  | Retained Earnings (Deficit) |  | AOCI |  | Treasury Shares |  | Non-controlling Interest
BALANCE, December 31, 2020 | 206.1 |  |  | $ | 82.6 |  |  | $ | 8,639.9 |  |  | $ | (4,183.8) |  |  | $ | (87.9) |  |  | $ | (76.2) |  |  | $ | (4.3) |
Net loss | — |  |  | — |  |  | — |  |  | (910.0) |  |  | — |  |  | — |  |  | 2.4 |
Shares issued under share-based compensation plans, net | — |  |  | — |  |  | (.2) |  |  | — |  |  | — |  |  | .2 |  |  | — |
Net changes in pension and other postretirement benefits | — |  |  | — |  |  | — |  |  | — |  |  | .1 |  |  | — |  |  | — |
Share-based compensation cost | — |  |  | — |  |  | 3.8 |  |  | — |  |  | — |  |  | — |  |  | — |
Net other comprehensive loss | — |  |  | — |  |  | — |  |  | — |  |  | (5.4) |  |  | — |  |  | — |
BALANCE, March 31, 2021 | 206.1 |  |  | $ | 82.6 |  |  | $ | 8,643.5 |  |  | $ | (5,093.8) |  |  | $ | (93.2) |  |  | $ | (76.0) |  |  | $ | (1.9) |
| Shares |  | Par Value |  | Additional Paid-in Capital |  | Retained Earnings (Deficit) |  | AOCI |  | Treasury Shares |  | Non-controlling Interest
BALANCE, December 31, 2019 | 205.9 |  |  | $ | 82.5 |  |  | $ | 8,627.8 |  |  | $ | 671.7 |  |  | $ | 6.2 |  |  | $ | (77.3) |  |  | $ | (1.3) |
Net loss | — |  |  | — |  |  | — |  |  | (3,006.3) |  |  | — |  |  | — |  |  | (1.4) |
Shares issued under share-based compensation plans, net | — |  |  | — |  |  | (.7) |  |  | — |  |  | — |  |  | .9 |  |  | — |
Repurchase of shares | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (.9) |  |  | — |
Share-based compensation cost | — |  |  | — |  |  | 7.8 |  |  | — |  |  | — |  |  | — |  |  | — |
Net other comprehensive loss | — |  |  | — |  |  | — |  |  | — |  |  | (13.4) |  |  | — |  |  | — |
BALANCE, March 31, 2020 | 205.9 |  |  | $ | 82.5 |  |  | $ | 8,634.9 |  |  | $ | (2,334.6) |  |  | $ | (7.2) |  |  | $ | (77.3) |  |  | $ | (2.7) |

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- Definition Schedule Of Activity In Our Various Shareholders Equity [Table Text Block] + References No definition available. + Details
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- Definition Shareholders' Equity [Abstract] + References No definition available. + Details
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Namespace Prefix: | val_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration