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Additional Financial Information (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Apr. 01, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | $ 3,156.9 |
Cumulative effect of accounting changes |  | $ 18.7
Other comprehensive loss | (32.1) |
Ending balance | 3,070.3 |
Foreign currency translation adjustments |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | (12.4) |
Cumulative effect of accounting changes |  | 0.0
Other comprehensive loss | (7.2) |
Ending balance | (19.6) |
Net unrealized gain (loss) on available-for-sale securities |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | 2.6 |
Cumulative effect of accounting changes |  | (2.6)
Other comprehensive loss | 0.0 |
Ending balance | 0.0 |
Net unrealized gain (loss) on cash flow hedges |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | 0.1 |
Cumulative effect of accounting changes |  | 0.0
Other comprehensive loss | (24.9) |
Ending balance | (24.8) |
Accumulated other comprehensive loss |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | (9.7) |
Cumulative effect of accounting changes |  | $ (2.6)
Other comprehensive loss | (32.1) |
Ending balance | $ (44.4) |

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