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History, Organization and Business Combination - Class of Stock (Details) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 20, 2016
Class of Stock [Line Items]
Preference shares, par value (in usd per share)	$ 0.0015144558	$ 0.0015144558
5.95% preference shares
Class of Stock [Line Items]
Preference shares, rate	5.95%	5.95%
Preference shares, issued (in shares)	11,000,000	11,000,000
Preference shares, par value (in usd per share)	$ 0.0015144558	$ 0.0015144558
5.625% preference shares
Class of Stock [Line Items]
Preference shares, rate	5.625%	5.625%
Preference shares, issued (in shares)	10,000,000	10,000,000	10,000,000
Preference shares, par value (in usd per share)	$ 0.0015144558	$ 0.0015144558

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

+ 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(28))
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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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