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Description of Business, Basis of Presentation and Significant Accounting Policies (Finite-Lived Intangible Assets) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Change in Accounting Estimate [Line Items]
Finite-lived intangible assets	$ 1,469.6				$ 1,621.6				$ 1,469.6	$ 1,621.6
Increase in amortization expense									$ 152.1	$ 112.6	$ 109.0
Increase in net loss per share, basic (in usd per share)	$ 0.20	$ 0.42	$ (0.01)	$ 0.25	$ 0.72	$ (0.11)	$ 0.67	$ 0.04	$ 0.86	$ 1.33	$ (2.27)
Increase in net loss per share, diluted (in usd per share)	$ 0.20	$ 0.42	$ (0.01)	$ 0.25	$ 0.72	$ (0.10)	$ 0.67	$ 0.04	$ 0.86	$ 1.33	$ (2.15)
Intangible Assets, Amortization Period
Change in Accounting Estimate [Line Items]
Increase in amortization expense									$ 38.7
Increase in net loss per share, basic (in usd per share)									$ 0.17
Increase in net loss per share, diluted (in usd per share)									$ 0.17
Customer relationships
Change in Accounting Estimate [Line Items]
Finite-lived intangible assets	$ 1,452.8				$ 1,601.2				$ 1,452.8	$ 1,601.2
Finite-Lived Intangible Asset, Useful Life				17 years
Minimum
Change in Accounting Estimate [Line Items]
Finite-Lived Intangible Asset, Useful Life									5 years
Maximum
Change in Accounting Estimate [Line Items]
Finite-Lived Intangible Asset, Useful Life									17 years

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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