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Post Retirement Benefit Plans - Plan Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Plan Assets:      
Plan assets $ 120.3 $ 105.9 $ 106.1
Group BPCE Life      
Plan Assets:      
Plan assets 1.1 1.3  
Swiss Life Collective BVG Foundation      
Plan Assets:      
Plan assets $ 119.2 $ 104.6  
Guaranteed minimum return on mandatory withdrawal portion of fund (as a percent) 1.75%    
Guaranteed minimum return on non-mandatory withdrawal portion of fund (as a percent) 0.75% 1.25%  
The Company's percentage of returns above the guaranteed minimum 90.00%    
Percentage of returns above the guaranteed minimum to be retained by Swiss Life 10.00%    
Swiss Life Collective BVG Foundation | Bonds including cash      
Plan Assets:      
Target allocation (as a percent) 75.00%    
Swiss Life Collective BVG Foundation | Equity Securities      
Plan Assets:      
Target allocation (as a percent) 5.00%    
Swiss Life Collective BVG Foundation | Real estate and mortgages      
Plan Assets:      
Target allocation (as a percent) 20.00%    
Significant Other Observable Inputs (Level 2)      
Plan Assets:      
Plan assets $ 120.3 $ 105.9  
Significant Other Observable Inputs (Level 2) | Group BPCE Life      
Plan Assets:      
Plan assets 1.1 1.3  
Significant Other Observable Inputs (Level 2) | Swiss Life Collective BVG Foundation      
Plan Assets:      
Plan assets $ 119.2 $ 104.6