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Accounting Developments New Accounting Pronouncements and Changes in Accounting Principles (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Jan. 01, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |
Increase (Decrease) in Accrued Investment Income Receivable | $ 95.2 | $ 103.7 |  |
Proceeds from Sales and Maturities of Other Investments | 82.3 | 46.5 |  |
Compensation Expense | 221.7 | 209.0 |  |
Other Expenses | 224.2 | 228.8 |  |
Other Long-term Investments | 706.5 |  |  | $ 646.8
Deferred Income Tax | 128.9 |  |  | 199.0
Accumulated Other Comprehensive Income (Loss) | (82.4) |  |  | 127.5
Retained Earnings | $ 9,777.8 |  |  | 9,542.2
Accounting Standards Update 2016-15 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |
Increase (Decrease) in Accrued Investment Income Receivable |  | 4.4 |  |
Proceeds from Sales and Maturities of Other Investments |  | 46.5 |  |
Accounting Standards Update 2016-15 | Scenario, Previously Reported |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |
Increase (Decrease) in Accrued Investment Income Receivable |  | 2.2 |  |
Proceeds from Sales and Maturities of Other Investments |  | 48.7 |  |
Accounting Standards Update 2016-15 | Restatement Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |
Increase (Decrease) in Accrued Investment Income Receivable |  | 2.2 |  |
Proceeds from Sales and Maturities of Other Investments |  | (2.2) |  |
Accounting Standards Update 2017-07 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |
Compensation Expense |  | 209.0 |  |
Other Expenses |  | 228.8 |  |
Accounting Standards Update 2017-07 | Scenario, Previously Reported |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |
Compensation Expense |  | 207.0 |  |
Other Expenses |  | 230.8 |  |
Accounting Standards Update 2017-07 | Restatement Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |
Compensation Expense |  | 2.0 |  |
Other Expenses |  | $ (2.0) |  |
Accounting Standards Update 2016-01 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |
Other Long-term Investments |  |  | $ 643.0 | 646.8
Deferred Income Tax |  |  | 198.2 | 199.0
Accumulated Other Comprehensive Income (Loss) |  |  | 110.0 | 127.5
Retained Earnings |  |  | 9,556.7 | $ 9,542.2
Accounting Standards Update 2016-01 | Restatement Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |
Other Long-term Investments |  |  | (3.8) |
Deferred Income Tax |  |  | (0.8) |
Accumulated Other Comprehensive Income (Loss) |  |  | (17.5) |
Retained Earnings |  |  | $ 14.5 |

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