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Noncontrolling Interests (Tables)
 12 Months Ended
Mar. 31, 2018
Noncontrolling Interest [Abstract]  
Redeemable Noncontrolling Interests
The table below presents the reconciliation of changes in redeemable noncontrolling interests:

 
Year Ended
 
March 31,
 
2018
 
2017
 
2016
 
(Amounts in millions)
Beginning balance
$
93.8

 
$
90.5

 
$
—

Initial fair value of redeemable noncontrolling interests
—

 
—

 
90.1

Net income (loss) attributable to noncontrolling interests
0.5

 
(0.3
)
 
(7.5
)
Noncontrolling interest discount accretion
6.1

 
5.0

 
2.0

Adjustments to redemption value
9.3

 
5.5

 
5.9

Cash distributions
(7.9
)
 
(6.9
)
 
—

Ending balance
$
101.8

 
$
93.8

 
$
90.5