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Income Taxes, Provision for Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
U.S. Federal [Abstract] |  |  |  |
Current |  | $ 12.2 | $ 1.3 | $ 30.3
Noncurrent Federal Tax Expense |  | 122.2 | 0.0 | 0.0
Deferred |  | (9.2) | (11.1) | 17.8
Total U.S. Federal |  | 125.2 | (9.8) | 48.1
State and Local [Abstract] |  |  |  |
Current |  | 5.4 | 8.2 | 5.3
Noncurrent State and Local Tax Expense (Benefit) |  | 19.1 | 0.0 | 0.0
Deferred |  | (7.4) | (4.0) | 1.9
Total State and Local |  | 17.1 | 4.2 | 7.2
International [Abstract] |  |  |  |
Current |  | 141.2 | 105.4 | 81.9
Deferred |  | (15.7) | 8.2 | (4.4)
Total International |  | 125.5 | 113.6 | 77.5
Total provision for income taxes |  | $ 267.8 | $ 108.0 | $ 132.8
U.S. federal income tax rate | 21.00% | 35.00% | 35.00% | 35.00%
Increase or decrease in current tax expense from utilization of prior years' net operating loss carryovers |  | $ 3.0 | $ (21.8) | $ 16.8

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