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Noncontrolling Interests (Narrative) (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Nov. 12, 2015 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Redeemable Noncontrolling Interest [Line Items] |  |  |  |
Initial fair value of redeemable noncontrolling interests |  | $ 0.0 | $ 0.0 | $ 90.1
Pilgrim Media Group |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |
Initial fair value of redeemable noncontrolling interests | $ 90.1 |  |  |
Redeemable noncontrolling interest, ownership percentage held by noncontrolling owner | 37.50% |  |  |
Portion of noncontrolling interest redeemable after first term, five years after November 12, 2015 |  | 17.50% |  |
First Put/ Call Option, Term |  | 5 years |  |
Second Put/ Call Option, Term |  | 7 years |  |

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- Details
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