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Life, Accident and Health Reserves - By Product Line (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Liability for Claims and Claims Adjustment Expense [Line Items]
Total life, accident and health reserves	$ 4,536.6	$ 4,562.1
Long-term care insurance reserves
Liability for Claims and Claims Adjustment Expense [Line Items]
Total life, accident and health reserves	4,158.5	4,142.5
Traditional life insurance reserves
Liability for Claims and Claims Adjustment Expense [Line Items]
Total life, accident and health reserves	179.9	196.8
Other accident and health insurance reserves
Liability for Claims and Claims Adjustment Expense [Line Items]
Total life, accident and health reserves	$ 198.2	$ 222.8