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Redeemable Noncontrolling Interest (Changes In Redeemable Noncontrolling Interest) (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Increase (Decrease) in Temporary Equity [Roll Forward]    
Beginning balance $ 93.8 $ 90.5
Net income (loss) attributable to noncontrolling interest 0.7 (0.5)
Noncontrolling interest discount accretion 1.2 1.3
Adjustments to redemption value 2.3 2.7
Cash distributions 3.0 2.2
Ending balance $ 95.0 $ 91.8