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Debt (Narrative - Senior Credit Facilities) (Details) $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($) reduction	Jun. 30, 2016 USD ($)	Mar. 31, 2017	Feb. 28, 2017 USD ($)	Dec. 08, 2016 USD ($)
Line of Credit Facility [Abstract]
Term loan B facility, initial issuance price, percentage					99.50%
Loss on extinguishment of debt	$ 11.6	$ 0.0
Revolving Credit Facility
Line of Credit Facility [Abstract]
Revolving credit facility, maximum borrowing capacity	$ 1,000.0				$ 1,000.0
Debt instrument, term	5 years
Revolving credit facility, available amount	$ 1,000.0
Number of possible reductions in margin | reduction	2
Effective interest rate	3.22%
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			1.50%
LIBOR | Revolving Credit Facility
Line of Credit Facility [Abstract]
Basis spread on variable interest rate	2.00%		2.50%
Potential reduction in interest rate if certain leverage ratios are met, total	0.50%
Potential reduction in interest rate if certain leverage ratios are met, per reduction	0.25%
Term Loan A Facility | Term Loan
Line of Credit Facility [Abstract]
Debt instrument, term	5 years
Principal amount issued					1,000.0
Number of possible reductions in margin | reduction	2
Effective interest rate	3.22%
Quarterly principal payment percent, year one	1.25%
Quarterly principal payment percent, year two	1.25%
Quarterly principal payment percent, year three	1.75%
Quarterly principal payment percent, year four	2.50%
Quarterly principal payment percent, year five	2.50%
Term Loan A Facility | Base Rate | Term Loan
Line of Credit Facility [Abstract]
Basis spread on variable interest rate	1.50%
Term Loan A Facility | LIBOR | Term Loan
Line of Credit Facility [Abstract]
Basis spread on variable interest rate	2.50%
Potential reduction in interest rate if certain leverage ratios are met, total	0.50%
Potential reduction in interest rate if certain leverage ratios are met, per reduction	0.25%
Term Loan B Facility | Term Loan
Line of Credit Facility [Abstract]
Debt instrument, term	7 years
Principal amount issued	$ 420.0			$ 400.0	$ 2,000.0
Effective interest rate	4.22%
Quarterly principal payment percent	0.25%
Prepayment premium percent	1.00%
Term Loan B Facility | Base Rate | Term Loan
Line of Credit Facility [Abstract]
Basis spread on variable interest rate	2.00%
Term Loan B Facility | LIBOR | Term Loan
Line of Credit Facility [Abstract]
Basis spread on variable interest rate	3.00%
Term Loan B Facility | LIBOR | Minimum | Term Loan
Line of Credit Facility [Abstract]
Coupon rate	0.75%

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

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Face (par) amount of debt instrument at time of issuance.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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