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General (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2019	Apr. 01, 2019	Mar. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Liabilities	$ 167.4		$ 167.4
Operating Leases, Right-of-use assets	140.3		140.3		$ 0.0
Accounting for Leases
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Liabilities				$ 187.2
Operating Leases, Right-of-use assets				157.4
Lease Incentives				$ 29.8
Customer relationships
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Finite-lived intangible assets	1,500.0		1,500.0
Finite-Lived Intangible Asset, Useful Life		17 years
Intangible Assets, Amortization Period
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in amortization expense	$ 12.2		$ 23.5
Decrease in earnings per share, basic and diluted (in usd per share)	$ 0.06		$ 0.11

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This item represents the deferred charge for an incentive or inducement granted by a lessor to a lessee, in order to motivate the lessee to enter the lease agreement, which incentive or inducement is to be recognized as a reduction of rental revenue over the lease term.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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