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Equity, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss) |  |  |
Balance at beginning of period | $ 4,530.3 |  |
Reclassification of the stranded tax effects of the Tax Act |  |  | $ 0.0
Balance at end of period | 5,384.9 | $ 4,530.3 |
Accumulated Other Comprehensive Loss |  |  |
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss) |  |  |
Balance at beginning of period | (430.9) | (390.2) | (201.0)
Other comprehensive income (loss) before reclassification, net of tax | 132.2 | (56.0) | (185.9)
Amounts reclassified from Accumulated other comprehensive income (loss) to earnings, net of tax | 20.6 | 15.3 | 20.2
Reclassification of the stranded tax effects of the Tax Act |  |  | (23.5)
Balance at end of period | (278.1) | (430.9) | (390.2)
Accumulated Other Comprehensive Loss | ASU 2018-02 |  |  |
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss) |  |  |
Reclassification of the stranded tax effects of the Tax Act |  |  | (23.5)
Foreign Currency Translation Adjustment |  |  |
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss) |  |  |
Balance at beginning of period | (237.9) | (197.5) | (33.2)
Other comprehensive income (loss) before reclassification, net of tax | 151.3 | (40.4) | (164.3)
Amounts reclassified from Accumulated other comprehensive income (loss) to earnings, net of tax | 0.0 | 0.0 | 0.0
Balance at end of period | (86.6) | (237.9) | (197.5)
Foreign currency translation adjustments, tax | 0.0 | 0.0 | 0.0
Foreign Currency Translation Adjustment | ASU 2018-02 |  |  |
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss) |  |  |
Reclassification of the stranded tax effects of the Tax Act |  |  | 0.0
Unrealized Gain (Loss) on Hedging Activities |  |  |
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss) |  |  |
Balance at beginning of period | 0.3 | 0.2 | (0.2)
Other comprehensive income (loss) before reclassification, net of tax | (0.2) | 0.1 | 0.4
Amounts reclassified from Accumulated other comprehensive income (loss) to earnings, net of tax | 0.0 | 0.0 | 0.0
Balance at end of period | 0.1 | 0.3 | 0.2
Unrealized (gain) loss on hedging activities, tax | 0.0 | 0.0 | (0.1)
Unrealized Gain (Loss) on Hedging Activities | ASU 2018-02 |  |  |
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss) |  |  |
Reclassification of the stranded tax effects of the Tax Act |  |  | 0.0
Defined Benefit Plan Liability Adjustment |  |  |
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss) |  |  |
Balance at beginning of period | (193.3) | (192.9) | (167.6)
Other comprehensive income (loss) before reclassification, net of tax | (18.9) | (15.7) | (22.0)
Amounts reclassified from Accumulated other comprehensive income (loss) to earnings, net of tax | 20.6 | 15.3 | 20.2
Balance at end of period | (191.6) | (193.3) | (192.9)
Pension and postretirement benefit plan adjustment, tax | 7.1 | 5.3 | 6.6
Amounts reclassified from Accumulated Other Comprehensive Income (Loss), tax | $ (6.7) | $ (4.9) | (6.4)
Defined Benefit Plan Liability Adjustment | ASU 2018-02 |  |  |
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss) |  |  |
Reclassification of the stranded tax effects of the Tax Act |  |  | $ (23.5)

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