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Equity - Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | $ 2,561.4 | $ 3,210.4 | $ 2,707.1
Other comprehensive income (loss), net of tax | 130.1 | (92.3) | (74.1)
Ending balance | 2,984.2 | 2,561.4 | 3,210.4
Cumulative Effect, Period of Adoption, Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | 2.4 |
Ending balance |  |  | 2.4
Foreign currency adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | (77.7) | (101.5) | (6.2)
Other comprehensive income (loss) before reclassifications | 101.7 | (15.2) | (95.3)
Amounts reclassified from accumulated other comprehensive income (loss) | 0.0 | 0.0 | 0.0
Other comprehensive income (loss), net of tax |  | (15.2) |
Ending balance | 24.0 | (77.7) | (101.5)
Foreign currency adjustments | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | 0.0 |
Ending balance |  |  | 0.0
Derivative instruments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | 11.2 | 5.2
Other comprehensive income (loss) before reclassifications |  |  | 13.7
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | (7.7)
Ending balance |  |  | 11.2
Derivative Instruments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | (65.0) |  |
Other comprehensive income (loss) before reclassifications | (2.5) | (69.0) |
Amounts reclassified from accumulated other comprehensive income (loss) | (4.3) | (8.2) |
Other comprehensive income (loss), net of tax |  | (77.2) |
Ending balance | (71.8) | (65.0) |
Derivative Instruments | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | 1.0 |
Ending balance |  |  | 1.0
Pension and other postretirement benefits |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | (269.3) | (218.6) | (239.3)
Other comprehensive income (loss) before reclassifications | 18.9 | (6.5) | 4.2
Amounts reclassified from accumulated other comprehensive income (loss) | 16.0 | 9.9 | 16.5
Other comprehensive income (loss), net of tax |  | 3.4 |
Ending balance | (234.4) | (269.3) | (218.6)
Pension and other postretirement benefits | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (54.1) |
Ending balance |  |  | (54.1)
Total |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | (412.0) | (308.9) | (240.3)
Other comprehensive income (loss) before reclassifications | 118.1 | (90.7) | (77.4)
Amounts reclassified from accumulated other comprehensive income (loss) | 11.7 | 1.7 | 8.8
Other comprehensive income (loss), net of tax |  | (89.0) |
Ending balance | $ (282.2) | (412.0) | (308.9)
Total | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (53.1) |
Ending balance |  |  | $ (53.1)
Discontinued Operations | Foreign currency adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), net of tax |  | 39.0 |
Discontinued Operations | Derivative Instruments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), net of tax |  | 0.0 |
Discontinued Operations | Pension and other postretirement benefits |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), net of tax |  | 0.0 |
Discontinued Operations | Total |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), net of tax |  | $ 39.0 |

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