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Common shares (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 4 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 04, 2019 | Jun. 05, 2019 | Jun. 17, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 02, 2018
Equity [Abstract] |  |  |  |  |  |  |
Common shares, par value (in dollars per share) |  | $ 0.10 |  | $ 0.10 | $ 0.10 | $ 0.10 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance, shares |  |  |  | 100,234,973 | 100,000,000 |  |
Common stock, value issued |  |  |  | $ 10 | $ 10 |  |
RSU share issuance (in shares) | 234,973 |  | 149,462 | 149,462 | 234,973 |  |
Ending balance, shares |  |  |  | 100,384,435 | 100,234,973 |  |
Common stock, value issued |  |  |  | $ 10 | $ 10 |  |
Common shares, additional authorized (in shares) |  | 27,768,889 |  |  |  |  |
Total, fully diluted (in shares) |  | 138,880,000 |  | 138,880,000 | 138,880,000 |  | 111,111,111

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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