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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 |  |  |  |  |  |  |

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