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Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Redeemable Noncontrolling Interest, Equity, Rollforwad [Roll Forward]                
Beginning Balance     $ 304.3       $ 304.3  
Net Loss Attributable to Redeemable Noncontrolling Interest             (3.2)  
Other Comprehensive Income, Net of Tax $ 0.3     $ (0.8)     8.9 $ (1.0)
Redemption of IP's Ownership Interest (210.9)       $ 19.1 $ (6.7) (296.1)  
Redeemable Noncontrolling Interest Redemption Value Adjustment 0.5 $ 5.4 $ (18.1)       (12.2)  
Distributions of Membership Interest             (1.7)  
Ending Balance $ 0.0           $ 0.0