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Noncontrolling Interest Noncontrolling Interest (Details)
$ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
Noncontrolling Interest [Abstract]  
Redeemable Noncontrolling Interest $ 3.8
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests (3.8)
Redeemable Noncontrolling Interest 0.0
Change in fair value of redeemable noncontrolling interest 2.3
Additional Paid-In Capital [Member]  
Noncontrolling Interest [Abstract]  
Change in fair value of redeemable noncontrolling interest $ 2.3