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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Details) - Nonrecurring Fair Value Measurements - Fair value hierarchy Level 3 - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mortgage loans      
Assets and liabilities measured at fair value on a nonrecurring basis      
Fair value of assets measured on nonrecurring basis $ 0.9 $ 2.7 $ 9.4
Mortgage loans | Net realized capital gains (losses)      
Assets and liabilities measured at fair value on a nonrecurring basis      
Net (gain) loss due to change in fair value of assets measured on nonrecurring basis 0.3 2.4 3.0
Real estate      
Assets and liabilities measured at fair value on a nonrecurring basis      
Fair value of assets measured on nonrecurring basis 2.1 13.9 $ 30.9
Net (gain) loss due to change in fair value of assets measured on nonrecurring basis $ 1.1 $ 5.3  
Discount rate (as a percent) 11.50% 10.30%  
Terminal capitalization rate (as a percent) 9.00% 9.00%  
Average market rent growth rate (as a percent)   0.00%  
Real estate | Minimum      
Assets and liabilities measured at fair value on a nonrecurring basis      
Discount rate (as a percent)     8.60%
Terminal capitalization rate (as a percent)     7.30%
Average market rent growth rate (as a percent)     2.70%
Real estate | Maximum      
Assets and liabilities measured at fair value on a nonrecurring basis      
Discount rate (as a percent)     10.50%
Terminal capitalization rate (as a percent)     8.50%
Average market rent growth rate (as a percent)     3.00%
Real estate | Net realized capital gains (losses)      
Assets and liabilities measured at fair value on a nonrecurring basis      
Net (gain) loss due to change in fair value of assets measured on nonrecurring basis   $ 0.8 $ 2.9
Real estate | Net investment income      
Assets and liabilities measured at fair value on a nonrecurring basis      
Net (gain) loss due to change in fair value of assets measured on nonrecurring basis   $ 4.5  
Brazil mutual fund company | Intangible assets      
Assets and liabilities measured at fair value on a nonrecurring basis      
Fair value of assets measured on nonrecurring basis     0.0
Brazil mutual fund company | Intangible assets | Operating expense      
Assets and liabilities measured at fair value on a nonrecurring basis      
Net (gain) loss due to change in fair value of assets measured on nonrecurring basis     $ 23.0