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Debt and liquidity (Senior Subordinated Notes) (Details) - USD ($) $ in Millions		12 Months Ended
	Nov. 30, 2010	Dec. 31, 2017
Debt Instrument [Line Items]
Subordinated Borrowing, Interest Rate		7.00%
Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Notes Issued	$ 200
Subordinated Borrowing, Interest Rate	7.00%

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The fair value of notes issued in noncash investing and financing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586

+ Details

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Balance Type:	credit
Period Type:	duration

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- Definition

Stated interest rate of the subordinated debt.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

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- Details

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