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Summary of Significant Accounting Principles and Practices (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2015
GBP (£)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
GBP (£)
Dec. 31, 2014
USD ($)
Dec. 31, 2012
USD ($)
Cash and Cash Equivalents                
Cash and cash equivalents and short-term investments         $ 740.0   $ 800.0  
Restricted cash and investments, current         105.0   169.0  
Operating funds in U.K.       £ 43,327,000.000 64.6 £ 42,000,000 65.3  
Cash and cash equivalents, restricted         40.0   104.0  
Fiduciary Assets and Liabilities                
Premium trust balances         3,400.0   4,000.0  
Allowance for Doubtful Accounts                
Allowance for doubtful accounts     $ 90.0   $ 58.0   $ 74.0 $ 118.0
Foreign Currency                
Effect of foreign exchange gains (losses) on the consolidated statements of income $ 11.0 $ (1.0) 3.0          
Loss on hedging activity $ (19.0) $ (19.0) $ (10.0)          
Buildings [Member]                
Fixed Assets                
Fixed assets, original life, weighted-average 35 years              
Automobiles [Member]                
Fixed Assets                
Fixed assets, original life, weighted-average 6 years              
Minimum [Member]                
Revenue Recognition                
Term of outsourcing contracts for benefit services 3 years              
Term of outsourcing contracts for HR BPO services 5 years              
Goodwill and Intangible Assets                
Useful life of finite-lived intangible assets 1 year              
Minimum [Member] | Software [Member]                
Fixed Assets                
Fixed assets, original life, weighted-average 4 years              
Minimum [Member] | Furniture, fixtures and equipment [Member]                
Fixed Assets                
Fixed assets, original life, weighted-average 4 years              
Minimum [Member] | Computer equipment [Member]                
Fixed Assets                
Fixed assets, original life, weighted-average 4 years              
Maximum [Member]                
Revenue Recognition                
Term of outsourcing contracts for benefit services 5 years              
Term of outsourcing contracts for HR BPO services 10 years              
Goodwill and Intangible Assets                
Useful life of finite-lived intangible assets 16 years              
Maximum [Member] | Software [Member]                
Fixed Assets                
Fixed assets, original life, weighted-average 7 years              
Maximum [Member] | Leasehold improvements [Member]                
Fixed Assets                
Fixed assets, original life, weighted-average 10 years              
Maximum [Member] | Furniture, fixtures and equipment [Member]                
Fixed Assets                
Fixed assets, original life, weighted-average 10 years              
Maximum [Member] | Computer equipment [Member]                
Fixed Assets                
Fixed assets, original life, weighted-average 6 years              
Weighted average [Member]                
Goodwill and Intangible Assets                
Useful life of finite-lived intangible assets 11 years