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Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Abstract]            
Beginning Balance     $ 275.8   $ 275.8  
Net Income Attributable to Redeemable Noncontrolling Interest         13.8  
Other Comprehensive Loss, Net of Tax $ (0.8)     $ 0.2 (1.0) $ (0.1)
Reclassification to Redeemable Noncontrolling Interest for Share Repurchases   $ (19.1) $ 6.7   12.5  
Distributions of Membership Interest         (4.8)  
Ending Balance $ 271.3       $ 271.3