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v3.19.3.a.u2

OTHER DISCLOSURES. (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Expense recognized for defined contribution retirement plans | $ 104.6 | $ 105.6 | $ 89.4
Senior officers | Supplemental Savings Plan |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Supplemental Savings Plan, minimum deferral period | 2 years |  |
Supplemental Savings Plan, maximum deferral period | 15 years |  |
Amount of cash incentive compensation senior officers elected to defer | $ 107.5 | $ 118.9 | $ 95.5
Maximum | Senior officers | Supplemental Savings Plan |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Deferral percentage of cash incentive compensation | 100.00% |  |

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