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Segment Information (Adjusted Depreciation and Amortization) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Depreciation and amortization		$ 41.0	$ 39.7	$ 122.1	$ 119.0
Adjusted depreciation and amortization	[1]	10.1	9.8	30.4	29.2
Purchase accounting and related adjustments | Corporate and reconciling items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Depreciation and amortization		$ (30.9)	$ (29.9)	$ (91.7)	$ (89.8)
[1] Adjusted depreciation and amortization represents depreciation and amortization as presented on our unaudited condensed consolidated statements of operations less the depreciation and amortization related to the non-cash fair value adjustments to property and equipment and intangible assets acquired in recent acquisitions which are included in the purchase accounting and related adjustments line item above, as shown in the table below: Three Months Ended Nine Months Ended December 31, December 31, 2018 2017 2018 2017 (Amounts in millions)Depreciation and amortization$41.0 $39.7 $122.1 $119.0Less: Amount included in purchase accounting and related adjustments(30.9) (29.9) (91.7) (89.8)Adjusted depreciation and amortization$10.1 $9.8 $30.4 $29.2

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- Definition

The amount of depreciation and amortization as presented on the statement of operations, less the depreciation and amortization related to the non-cash fair value adjustments to property and equipment and intangible assets acquired in the acquisition of businesses, which are included in purchase accounting and related adjustments.

+ References

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- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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