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Noncontrolling Interest Noncontrolling Interest (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Noncontrolling Interest [Abstract]  
Redeemable Noncontrolling Interest $ 0.0
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests 8.4
Redeemable Noncontrolling Interest $ 8.4