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Noncontrolling Interest Noncontrolling Interest (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Noncontrolling Interest [Abstract]      
Redeemable Noncontrolling Interest   $ 0.0 $ 3.8
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests   8.4 (3.8)
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest $ 0.1 0.1  
Redeemable Noncontrolling Interest $ 8.5 $ 8.5  
Additional Paid-In Capital [Member]      
Redeemable Noncontrolling Interest, Equity, Redemption Value     $ 2.3