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Accumulated Other Comprehensive Loss, Net of Tax Changes in AOCI (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Derivative instruments, before reclassifications | $ 11.3 | $ 0.0 | $ 0.0
Total other comprehensive income, before reclassifications | 22.3 | (2.7) |
Total reclassification from AOCI | 27.5 | 13.8 | 22.1
Accumulated other comprehensive loss, net of tax | (880.2) | (930.0) | (941.1)
Foreign Currency Translation Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Foreign currency translation adjustment, before reclassifications | 40.1 | 12.0 |
Foreign currency translation adjustment, amount reclassified from AOCI, net of tax | 20.0 | 6.7 |
Foreign currency translation adjustment, net of tax | (637.6) | (697.7) | (716.4)
Derivative Instruments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Derivative instruments, before reclassifications | 8.5 | 0.0 |
Derivative instruments, amount reclassified from AOCI, net of tax | 1.8 | 1.8 |
Derivative Instruments, net of tax | 6.8 | (3.5) | (5.3)
Defined Benefit and Postretirement Plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Defined Benefit and Postretirement Plans, before reclassifications | (26.3) | (14.7) |
Defined benefit and Postretirement Plans, amount reclassified from AOCI, net of tax | 5.7 | 5.3 |
Pension and Other Postretirement Benefit Plans, net of tax | $ (249.4) | $ (228.8) | $ (219.4)

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