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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