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Debt (Narrative) (Details) € in Millions, $ in Millions | Dec. 31, 2019 USD ($) | Dec. 31, 2019 EUR (€) | Jun. 30, 2019 USD ($) | Jun. 30, 2019 EUR (€) | Mar. 31, 2000 USD ($)
--- | --- | --- | --- | --- | ---
Senior Notes [Member] | INA Senior Notes Due December 2024 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt stated interest rate | 0.30% | 0.30% |  |  |
Make Whole Premium Additional Percent | 0.15% | 0.15% |  |  |
Debt Instrument, Face Amount | $ 779.0 | € 700 |  |  |
Senior Notes [Member] | INA Senior Notes Due December 2029 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt stated interest rate | 0.875% | 0.875% |  |  |
Make Whole Premium Additional Percent | 0.20% | 0.20% |  |  |
Debt Instrument, Face Amount | $ 779.0 | € 700 |  |  |
Senior Notes [Member] | INA Senior Note Due June 2027 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt stated interest rate |  |  | 0.875% | 0.875% |
Debt Instrument, Face Amount |  |  | $ 650.0 | € 575 |
Senior Notes [Member] | INA Senior Note Due June 2031 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt stated interest rate |  |  | 1.40% | 1.40% |
Debt Instrument, Face Amount |  |  | $ 650.0 | € 575 |
Trust Preferred Securities | INA capital securities due 2030 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt stated interest rate | 9.70% | 9.70% |  |  | 9.70%
ACE Capital Trust II common securities purchased |  |  |  |  | $ 9.2
Debt Instrument, Face Amount | $ 309.0 |  |  |  | $ 300.0
Senior Notes [Member] | INA Senior Notes Due June 2019 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt stated interest rate | 5.90% | 5.90% | 5.90% | 5.90% |
Debt Instrument, Face Amount | $ 500.0 |  | $ 500.0 |  |

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