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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES. (Newly issued but not yet adopted accounting guidance) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 01, 2018 | Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of revenue related expenses to operating expenses |  |  |  |  |  |  |  |  | $ 2,684.2 | $ 2,489.5 | $ 2,301.7 |  |
Reclassification of revenue related expenses from revenue to operating expenses | $ 1,286.1 | $ 1,221.7 | $ 1,171.6 | $ 1,113.6 | $ 1,091.2 | $ 1,092.9 | $ 1,044.7 | $ 994.1 | 4,793.0 | 4,222.9 | 4,200.6 |  |
Reclassification of unrealized holding gains recognized on investments from AOCI to retained earnings | 5,824.4 |  |  |  | 5,008.6 |  |  |  | 5,824.4 | 5,008.6 | 4,762.0 |  | $ 5,395.2
Pro forma [Member] | ASU 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of revenue related expenses to operating expenses |  |  |  |  |  |  |  |  | 60.0 | 60.0 |  |  |
Reclassification of revenue related expenses from revenue to operating expenses |  |  |  |  |  |  |  |  | 60.0 | 60.0 |  |  |
Net unrealized holding gains or losses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of unrealized holding gains recognized on investments from AOCI to retained earnings | $ 7.9 |  |  |  | $ 52.2 |  |  |  | $ 7.9 | $ 52.2 | $ 120.3 |  | $ 165.5
Subsequent event [Member] | Net unrealized holding gains or losses [Member] | ASU 2016-01 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of unrealized holding gains recognized on investments from AOCI to retained earnings |  |  |  |  |  |  |  |  |  |  |  | $ (7.9) |
Subsequent event [Member] | Retained earnings [Member] | ASU 2016-01 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of unrealized holding gains recognized on investments from AOCI to retained earnings |  |  |  |  |  |  |  |  |  |  |  | $ 7.9 |

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