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Summary of significant accounting policies (Details) $ in Millions		1 Months Ended
	Jan. 01, 2016 USD ($)	Aug. 31, 2014 state	Mar. 31, 2016 USD ($)
Minimum age of ambulatory patient		5 years
Number of member states of the European Economic Area | state		31
Accounting Standards Update 2015-03 | Deposits and Other Assets
Debt issuance cost	$ 2.8
Accounting Standards Update 2015-03 | Long-term debt.
Debt issuance cost	$ 2.8
Unamortized debt issuance cost			$ 2.7

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- Definition

Represents the minimum age of ambulatory patient.

+ References

No definition available.

+ Details

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- Definition

Represents the number of states in European economic area.

+ References

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- Definition

Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

+ References

No definition available.

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- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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