Acquisitions (Schedule of Financial Statement Caption Impacted by the Purchase Accounting Adjustments) (Details) - USD ($) $ in Millions		Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Jun. 30, 2013
Current assets
Trade receivables, net		$ 88.0				$ 57.2
Prepaid expenses		37.3				24.9
Total current assets		567.9				542.4
Property and equipment, net		3,299.2				2,822.4
Intangible assets, net		948.3				710.3
Goodwill		1,224.4				866.7	$ 688.8
Other assets		54.8				39.9
Total assets		6,094.6	$ 5,991.9	$ 4,989.2	$ 4,974.1	4,981.7	$ 4,152.1	[1]
Current liabilities
Accrued liabilities		182.2				175.1
Total current liabilities		386.9				357.5
Capital lease obligation, non-current		28.3				25.8
Deferred revenue, non-current		612.7				501.4
Deferred income taxes, net		174.7				135.6
Total liabilities		$ 4,883.4				4,565.3
Adjusted Balance [Member]
Current assets
Trade receivables, net						57.2
Prepaid expenses						24.9
Total current assets						82.1
Property and equipment, net						2,822.4
Intangible assets, net						710.3
Goodwill						866.7
Other assets						39.9
Total assets						4,521.4
Current liabilities
Accrued liabilities						175.1
Total current liabilities						175.1
Capital lease obligation, non-current						25.8
Deferred revenue, non-current						501.4
Deferred income taxes, net						135.6
Total liabilities						837.9
Previously Reported Balance [Member]
Current assets
Trade receivables, net	[2]					59.0
Prepaid expenses	[2]					25.6
Total current assets	[2]					84.6
Property and equipment, net	[2]					2,821.4
Intangible assets, net	[2]					709.7
Goodwill	[2]					845.3
Other assets	[2]					39.7
Total assets	[2]					4,500.7
Current liabilities
Accrued liabilities	[2]					162.5
Total current liabilities	[2]					162.5
Capital lease obligation, non-current	[2]					22.9
Deferred revenue, non-current	[2]					496.9
Deferred income taxes, net	[2]					134.9
Total liabilities	[2]					817.2
Purchase Accounting Adjustment [Member]
Current assets
Trade receivables, net						(1.8)
Prepaid expenses						(0.7)
Total current assets						(2.5)
Property and equipment, net						1.0
Intangible assets, net						0.6
Goodwill						21.4
Other assets						0.2
Total assets						20.7
Current liabilities
Accrued liabilities						12.6
Total current liabilities						12.6
Capital lease obligation, non-current						2.9
Deferred revenue, non-current						4.5
Deferred income taxes, net						0.7
Total liabilities						$ 20.7

[1] Assets of discontinued operations of $72.1 million are included in the Corp/elimination column for the year ended June 30, 2013

[2] As reported on Form S-1 filed with the SEC on March 13, 2015