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Fair Value Measurements (Details 5) - Nonrecurring Fair Value Measurements - Fair value hierarchy Level 3 - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Mortgage loans        
Assets and liabilities measured at fair value on a nonrecurring basis        
Fair value of assets measured on nonrecurring basis $ 13.9 $ 63.8 $ 13.9 $ 63.8
Mortgage loans | Minimum        
Assets and liabilities measured at fair value on a nonrecurring basis        
Discount rate (as a percent)       8.80%
Terminal capitalization rate (as a percent)       7.30%
Average market rent growth rate (as a percent)       2.50%
Mortgage loans | Maximum        
Assets and liabilities measured at fair value on a nonrecurring basis        
Discount rate (as a percent)       11.00%
Terminal capitalization rate (as a percent)       9.00%
Average market rent growth rate (as a percent)       10.90%
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 1.5 $ 9.7 3.3 $ 9.1
Intangible assets        
Assets and liabilities measured at fair value on a nonrecurring basis        
Fair value of assets measured on nonrecurring basis 0.0   0.0  
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   $ 23.0