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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
 [1]
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax $ 1,437.9 $ 1,414.1 $ 515.3 $ 1,343.5 $ 1,430.0 $ 1,677.4 $ 1,704.3 $ 1,719.2 $ 4,710.8 $ 6,530.9 $ 7,270.4
North America [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 3,625.1 5,247.1 5,840.3
Asia [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 477.5 571.2 678.3
Europe [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 550.5 607.3 622.1
South America [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 57.7 105.3 129.7
Driveline [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 3,605.5 4,449.7 4,911.4
Driveline [Member] | North America [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 2,770.1 3,466.3 3,823.1
Driveline [Member] | Asia [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 433.7 533.6 634.4
Driveline [Member] | Europe [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 352.5 351.0 329.0
Driveline [Member] | South America [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 49.2 98.8 124.9
Metal Forming [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 1,105.3 1,453.5 1,617.7
Metal Forming [Member] | North America [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 855.0 1,153.1 1,275.9
Metal Forming [Member] | Asia [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 43.8 37.6 43.9
Metal Forming [Member] | Europe [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 198.0 256.3 293.1
Metal Forming [Member] | South America [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 8.5 6.5 4.8
Casting [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 0.0 627.7 741.3
Casting [Member] | North America [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 0.0 627.7 741.3
Casting [Member] | Asia [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 0.0 0.0 0.0
Casting [Member] | Europe [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 0.0 0.0 0.0
Casting [Member] | South America [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 $ 0.0 $ 0.0 $ 0.0
[1] Many of our plant locations temporarily suspended production or experienced a significant reduction in production volumes during the second quarter of 2020 as a result of the impact of COVID-19.