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Significant accounting policies - Income taxes and uncertain tax positions (Details) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Investment Income [Member]
Jun. 30, 2013
Investment Income [Member]
Jun. 30, 2014
Investment Income [Member]
Jun. 30, 2013
Investment Income [Member]
Apr. 01, 2014
TPRUK [Member]
Her Majesty's Revenue and Customs (HMRC) [Member]
Mar. 31, 2014
TPRUK [Member]
Her Majesty's Revenue and Customs (HMRC) [Member]
Jun. 30, 2014
TPRUK [Member]
Her Majesty's Revenue and Customs (HMRC) [Member]
Jun. 30, 2014
TPRUK [Member]
Her Majesty's Revenue and Customs (HMRC) [Member]
Apr. 01, 2015
TPRUK [Member]
Her Majesty's Revenue and Customs (HMRC) [Member]
Scenario, Forecast [Member]
Income Tax Contingency [Line Items]                          
Corporate income tax rate                 21.00% 23.00%     20.00%
Income tax expense $ 2,375,000 $ 0 $ 2,375,000 $ 0             $ 20,000 $ 20,000  
Investment income, tax expense         (1,000,000) (200,000) (1,000,000) (500,000)          
Provision for uncertain tax positions $ 1,400,000 $ 0 $ 1,400,000 $ 0