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Fair Value Measurements (Quantitative Information Used as Level 3 Inputs) (Details) $ in Thousands	Jun. 30, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other investments	$ 1,093,338	$ 1,087,377
Other liabilities	(19,248)	(28,213)
Assumed and ceded (re)insurance contracts	12,537	32,944
Fair Value, Measurements, Recurring
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other investments	1,093,338	1,087,377
Other liabilities	(2,636)
Assumed and ceded (re)insurance contracts		21,668
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs	19,626,728	17,283,908
Fair Value, Measurements, Recurring | Fair Value (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other investments	71,450	74,634
Other liabilities	(6,711)
Assumed and ceded (re)insurance contracts		4,731
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs	64,739	79,365
Fair Value, Measurements, Recurring | Private equity investments
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other investments	254,257	271,047
Fair Value, Measurements, Recurring | Private equity investments | Fair Value (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other investments	71,450	74,634
Fair Value, Measurements, Recurring | Private equity investments | External valuation model | Fair Value (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other investments	1,143
Fair Value, Measurements, Recurring | Private equity investments | Internal valuation model | Fair Value (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other investments	70,307
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other liabilities	(6,711)
Assumed and ceded (re)insurance contracts		4,731
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts | Fair Value (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other liabilities	(6,711)
Assumed and ceded (re)insurance contracts		$ 4,731
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts | Internal valuation model | Fair Value (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other liabilities	(1,400)
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Fair Value (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other liabilities	(1,442)
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Fair Value (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other liabilities	(8,232)
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group three | Internal valuation model | Fair Value (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assumed and ceded (re)insurance contracts	$ 2,963
Manager pricing | Fair Value, Measurements, Recurring | Private equity investments | External valuation model | Fair Value (Level 3) | Low
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share) | $ / shares	277.73
Manager pricing | Fair Value, Measurements, Recurring | Private equity investments | External valuation model | Fair Value (Level 3) | High
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share) | $ / shares	369.09
Manager pricing | Fair Value, Measurements, Recurring | Private equity investments | External valuation model | Fair Value (Level 3) | Weighted Average or Actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share) | $ / shares	323.41
Discount rate | Fair Value, Measurements, Recurring | Private equity investments | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share) | $ / shares	0.080
Discount rate | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share)	0.003
Liquidity discount | Fair Value, Measurements, Recurring | Private equity investments | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share) | $ / shares	0.150
Liquidity discount | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share)	0.013
Bond price | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Fair Value (Level 3) | Low
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share) | $ / shares	88.09
Bond price | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Fair Value (Level 3) | High
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share) | $ / shares	99.25
Bond price | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share) | $ / shares	93.59
Net undiscounted cash flows | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share)	11,752,000
Expected loss ratio | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share)	0.283
Expected loss ratio | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group three | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share)	0.000

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