Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

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Long-Term Debt (Narrative) (Details) - USD ($) $ in Millions						3 Months Ended			9 Months Ended
	Jan. 19, 2017	Jul. 22, 2016	Apr. 14, 2016	Jan. 15, 2016	May 06, 2015	Mar. 31, 2017	Jun. 30, 2016	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Jan. 27, 2017	Jan. 19, 2016	Aug. 13, 2012
Debt Instrument [Line Items]
Payments of Debt Extinguishment Costs						$ 4.5			$ 4.5
Redemption of debt									1,837.4	$ 13.4
Loss on extinguishment of debt						$ 4.5			$ 4.5
Secured debt ratio						4.50			4.50
Unamortized Debt Issuance Costs Associated with Previous Indebtedness						$ (1.8)	$ (11.4)
Debt issuance costs						118.4			$ 118.4
Accumulated amortization						42.7	35.8		42.7
Interest expense associated with the amortization of debt issuance costs						2.5		$ 2.6	6.9	7.6
Fair value of interest rate swaps						0.8	$ 3.0		0.8
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Derivative, notional amount													$ 750.0
Derivative, fixed interest rate													1.67%
Derivative, floor rate													1.25%
Change in fair value of interest rate swap						$ 0.7		$ 0.3	$ 2.2	$ (0.3)
Secured Debt [Member] \| Revolver [Member]
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity					$ 450.0
Weighted average interest rate (including margins)						3.70%	3.40%		3.70%
Remaining borrowing capacity						$ 442.2			$ 442.2
Percentage of excess revolver committed to debt payments									35.00%
Secured debt ratio						5.25			5.25
Secured Debt [Member] \| Letter Of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity					$ 50.0
Unused commitment, percentage					0.25%
Outstanding letters of credit						$ 7.8			$ 7.8
Term Loan Facility [Member]
Debt Instrument [Line Items]
Payment towards principal					$ 5.1
Percentage of excess cash flows committed to debt payments					50.00%
Discount on debt						$ 21.6	$ 19.0		$ 21.6
Weighted average interest rate (including margins)						3.40%	3.90%		3.40%
Debt instrument, face amount	$ 1,850.0
Repriced percentage	99.75%
Redemption of debt			$ 196.0
Loss on extinguishment of debt			2.1
Term Loan Facility [Member] \| Electric Lightwave
Debt Instrument [Line Items]
Debt instrument, face amount	$ 650.0
Incremental Term Loan [Member]
Debt Instrument [Line Items]
Line of credit facility increase to borrowing capacity				$ 400.0
Priced percent of additional line of credit				99.00%
Discount on debt				$ 4.8
Minimum \| Secured Debt [Member] \| Revolver [Member]
Debt Instrument [Line Items]
Unused commitment, percentage					0.25%
Maximum
Debt Instrument [Line Items]
Total indebtedness ratio						6.00			6.00
Maximum \| Secured Debt [Member] \| Revolver [Member]
Debt Instrument [Line Items]
Unused commitment, percentage					0.375%
Tranche One [Member] \| Term Loan Facility [Member]
Debt Instrument [Line Items]
Interest rate decrease	(0.75%)
Debt instrument, face amount												$ 500.0
Tranche Two [Member] \| Term Loan Facility [Member]
Debt Instrument [Line Items]
Interest rate decrease	(0.25%)
Debt instrument, face amount	$ 1,350.0
6.00% Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Interest rate of debt redeemed						6.00%			6.00%
6.375% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Discount on debt						$ 14.6	$ 15.6		$ 14.6
Interest rate of debt redeemed						6.375%			6.375%
6.375% New Senior Notes due 2025 [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Discount on debt			15.9
Debt instrument, face amount			$ 550.0
Priced percent of new debt			97.10%
Senior Notes Due 2027 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount											$ 800.0
Interest rate of debt redeemed											5.75%
10.125% Senior Notes due 2020 [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Redemption of debt			$ 325.6
Interest rate of debt redeemed			10.125%
Redemption premium and accrued interest included in redemption amount			$ 20.3
LIBOR \| Term Loan Facility [Member]
Debt Instrument [Line Items]
Interest rate decrease					0.25%
Spread on interest rate					2.75%
LIBOR \| Term Loan Facility [Member] \| Electric Lightwave
Debt Instrument [Line Items]
Spread on interest rate	2.50%
LIBOR \| Incremental Term Loan [Member]
Debt Instrument [Line Items]
Interest rate decrease		0.75%
Spread on interest rate		2.75%		3.50%
LIBOR \| Minimum \| Secured Debt [Member] \| Letter Of Credit [Member]
Debt Instrument [Line Items]
Spread on interest rate					2.00%
LIBOR \| Minimum \| Term Loan Facility [Member]
Debt Instrument [Line Items]
Spread on interest rate					1.00%
LIBOR \| Minimum \| Term Loan Facility [Member] \| Electric Lightwave
Debt Instrument [Line Items]
Spread on interest rate	1.00%
LIBOR \| Minimum \| Incremental Term Loan [Member]
Debt Instrument [Line Items]
Spread on interest rate		1.00%		1.00%
LIBOR \| Maximum \| Secured Debt [Member] \| Letter Of Credit [Member]
Debt Instrument [Line Items]
Spread on interest rate					3.00%
LIBOR \| Tranche One [Member] \| Term Loan Facility [Member]
Debt Instrument [Line Items]
Spread on interest rate	2.00%
LIBOR \| Tranche Two [Member] \| Term Loan Facility [Member]
Debt Instrument [Line Items]
Spread on interest rate	2.50%
LIBOR \| Tranche Two [Member] \| Minimum \| Term Loan Facility [Member]
Debt Instrument [Line Items]
Spread on interest rate	1.00%