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Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Redeemable Noncontrolling Interest, Equity, Rollforwad [Roll Forward]            
Beginning Balance   $ 304.3     $ 304.3  
Net Loss Attributable to Redeemable Noncontrolling Interest         (5.2)  
Other Comprehensive Income, Net of Tax $ 0.2   $ (0.5)   8.6 $ (0.2)
Redemption of IP's Ownership Interest     $ 19.1 $ (6.7) (250.0)  
Redeemable Noncontrolling Interest Redemption Value Adjustment   $ (18.1)     (12.7)  
Distributions of Membership Interest         (1.2)  
Ending Balance $ 43.8       $ 43.8