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Debt (Narrative - Senior Credit Facilities) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 22, 2018
Line of Credit Facility [Abstract]
Quarterly principal payment percent, year four	2.50%
Revolving Credit Facility
Line of Credit Facility [Abstract]
Revolving credit facility, maximum borrowing capacity	$ 1,500.0		$ 1,500.0
Revolving credit facility, available amount	$ 1,500.0
Number of possible increases in margin	2
Effective interest rate	2.74%
Change in control, trigger percentage	50.00%
Letter of Credit
Line of Credit Facility [Abstract]
Letters of credit outstanding, amount	$ 0.0
Minimum | Revolving Credit Facility
Line of Credit Facility [Abstract]
Revolving credit facility, commitment fee annual percentage	0.25%
Maximum | Revolving Credit Facility
Line of Credit Facility [Abstract]
Revolving credit facility, commitment fee annual percentage	0.375%
Base Rate | Revolving Credit Facility
Line of Credit Facility [Abstract]
Basis spread on variable interest rate	0.75%
LIBOR | Revolving Credit Facility
Line of Credit Facility [Abstract]
Basis spread on variable interest rate	1.75%
Potential increase in interest rate if certain leverage ratios are met, total	0.50%
Potential increase in interest rate if certain leverage ratios are met, per increase	0.25%
LIBOR | Minimum | Revolving Credit Facility
Line of Credit Facility [Abstract]
Coupon rate	0.00%
Term Loan A | Term Loan
Line of Credit Facility [Abstract]
Number of possible increases in margin	2
Effective interest rate	2.74%
Quarterly principal payment percent	1.25%
Quarterly principal payment percent, year two	1.75%
Quarterly principal payment percent, year three	2.50%
Term Loan A | Base Rate | Term Loan
Line of Credit Facility [Abstract]
Basis spread on variable interest rate	0.75%
Term Loan A | LIBOR | Term Loan
Line of Credit Facility [Abstract]
Basis spread on variable interest rate	1.75%	1.75%
Potential increase in interest rate if certain leverage ratios are met, total	0.50%
Potential increase in interest rate if certain leverage ratios are met, per increase	0.25%
Term Loan A | LIBOR | Minimum | Term Loan
Line of Credit Facility [Abstract]
Coupon rate	0.00%
Term Loan B | Term Loan
Line of Credit Facility [Abstract]
Effective interest rate	3.24%
Quarterly principal payment percent	0.25%
Term Loan B | Base Rate | Term Loan
Line of Credit Facility [Abstract]
Basis spread on variable interest rate	1.25%
Term Loan B | LIBOR | Term Loan
Line of Credit Facility [Abstract]
Basis spread on variable interest rate	2.25%
Term Loan B | LIBOR | Minimum | Term Loan
Line of Credit Facility [Abstract]
Coupon rate	0.00%

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- Definition

Trigger for change in control for purposes of senior revolving credit facility, as a percentage

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Debt Instrument, Periodic Payment, Quarterly Principal Payments, Year Five

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Debt Instrument, Periodic Payment, Quarterly Principal Payments, Year Three

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Debt Instrument, Periodic Payment, Quarterly Principal Payments, Year Two

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The effective interest rate at the end of the reporting period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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