Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	May 06, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Jan. 19, 2017	Jun. 30, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Carrying value of the notes		$ 5,523.8		$ 5,523.8			$ 4,085.3
Hypothetical annual interest expense				25.0
Hypothetical increase to interest rate swap fair value		1.8		$ 1.8
Interest Rate Swap [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Hypothetical interest rate increase				100.00%
Change in fair value of interest rate swap		0.7	$ 0.3	$ 2.2	$ (0.3)
Term Loan Facility [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Carrying value of the notes		2,478.4		$ 2,478.4			1,818.4
Debt instrument, face amount						$ 1,850.0
Hypothetical interest rate increase				1.00%
Term Loan Facility [Member] | LIBOR
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Spread on interest rate	2.75%
Tranche One [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt instrument, face amount		500.0		$ 500.0
Tranche One [Member] | LIBOR
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Floor rate				0.00%
Spread on interest rate				2.00%
Tranche Two [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt instrument, face amount		2,000.0		$ 2,000.0
Tranche Two [Member] | LIBOR
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Floor rate				1.00%
Spread on interest rate				2.50%
Notes [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Carrying value of the notes		3,121.1		$ 3,121.1			2,320.7
Fair value of the notes		$ 3,312.6		$ 3,312.6			$ 2,338.1