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Asset Impairment, Restructuring, and Other Special Charges (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Unusual or Infrequent Item [Line Items]                      
Severance                 $ 77.8 $ 127.8 $ 601.0
Asset impairment and other special charges                 497.8 139.1 283.9
Asset impairment, restructuring, and other special charges $ 151.7 $ 0.0 $ 0.0 $ 423.9 $ 192.7 $ 42.9 $ (25.5) $ 56.8 575.6 266.9 1,331.6
United States                      
Unusual or Infrequent Item [Line Items]                      
Pension and post-retirement medical charges associated with U.S. voluntary early retirement program (see Note 15)                 $ 0.0 $ 0.0 $ 446.7