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General (Recent Accounting Pronouncements) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Apr. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment for new accounting pronouncement					$ 60.8
Income tax provision	$ (204.2)	$ (12.2)	$ (205.0)	$ (92.2)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment for new accounting pronouncement					60.8
Retained Earnings | Employee Share-Based Payment Accounting
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment for new accounting pronouncement					54.3
Retained Earnings | Intra-Entity Transfers of Assets Other Than Inventory
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment for new accounting pronouncement					$ 6.5
Pro Forma | Intra-Entity Transfers of Assets Other Than Inventory
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax provision	$ 0.2		$ 3.5

X

- Definition

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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