Assets Held-for-Sale, Discontinued Operations, and Dispositions - Major Components of Assets and Liabilities Held-for-Sale (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jul. 01, 2019	Jun. 30, 2019
Current assets
Total current assets	$ 51.8		$ 321.0
Operating lease assets	487.7	$ 509.9
Current liabilities
Current portion of operating lease liabilities	34.9
Total current liabilities	1.8		252.1
Operating lease liabilities	484.2
Discontinued Operations, Held-for-sale
Current assets
Cash and cash equivalents	0.0		5.1
Accounts receivable, net	2.4		78.1
Inventories	0.0		0.1
Current portion of subscription acquisition costs	0.0		34.4
Other current assets	0.0		0.8
Total current assets	2.4		118.5
Net property, plant, and equipment	0.3		14.3
Operating lease assets	1.4
Subscription acquisition costs	0.0		19.2
Other assets	34.0		1.0
Intangible assets, net	0.8		43.9
Goodwill	12.9		124.1
Total assets held-for-sale	51.8		321.0
Current liabilities
Current portion of operating lease liabilities	0.1
Accounts payable	0.4		45.2
Accrued expenses and other liabilities	0.0		27.8
Current portion of unearned revenues	0.0		67.9
Deferred sale proceeds	0.0		73.2
Total current liabilities	0.5		214.1
Operating lease liabilities	1.3
Unearned revenues	0.0		37.6
Other noncurrent liabilities	0.0		0.4
Total liabilities associated with assets held-for-sale	$ 1.8		$ 252.1