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Equity, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss) |  |  |
Balance at beginning of period | $ 3,674.9 |  |
Balance at end of period | 3,989.8 | $ 3,674.9 |
Accumulated Other Comprehensive Loss |  |  |
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss) |  |  |
Balance at beginning of period | (469.0) | (349.5) | $ (205.8)
Other comprehensive income (loss) before reclassification, net of tax | 250.9 | (135.8) | (161.9)
Amounts reclassified from Accumulated other comprehensive income (loss) to earnings, net of tax | 17.1 | 16.3 | 18.2
Balance at end of period | (201.0) | (469.0) | (349.5)
Foreign Currency Translation Adjustments |  |  |
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss) |  |  |
Balance at beginning of period | (273.5) | (164.9) | (13.4)
Other comprehensive income (loss) before reclassification, net of tax | 240.3 | (108.6) | (151.5)
Balance at end of period | (33.2) | (273.5) | (164.9)
Foreign currency translation adjustments, tax | 0.0 | 0.0 | 0.0
Unrealized Gain (Loss) on Cash Flow Hedges |  |  |
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss) |  |  |
Balance at beginning of period | (0.1) | (1.7) | (1.3)
Other comprehensive income (loss) before reclassification, net of tax | (0.1) | 1.6 | (0.4)
Balance at end of period | (0.2) | (0.1) | (1.7)
Unrealized loss on cash flow hedges, tax | 0.1 | (0.3) | 0.1
Defined Benefit Plan Adjustment |  |  |
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss) |  |  |
Balance at beginning of period | (195.4) | (182.9) | (191.1)
Other comprehensive income (loss) before reclassification, net of tax | 10.7 | (28.8) | (10.0)
Amounts reclassified from Accumulated other comprehensive income (loss) to earnings, net of tax | 17.1 | 16.3 | 18.2
Balance at end of period | (167.6) | (195.4) | (182.9)
Defined benefit plan, before reclassification, tax | (3.4) | 12.3 | 5.5
Amounts reclassified from Accumulated Other Comprehensive Income (Loss), tax | $ (9.1) | $ (8.9) | $ (10.1)

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