Basis of Presentation and Consolidation - Reclassification of certain assets (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 1,113.0	$ 1,097.4	$ 3,593.2	$ 1,435.8
Accounts and notes receivable, net	481.4	488.8
Inventories, net	91.8	78.0
Advertising fund restricted assets		0.0
Prepaids and other current assets	48.7	85.4
Total current assets	1,734.9	1,749.6
Current liabilities:
Accounts and drafts payable	467.0	496.2
Other accrued liabilities	678.4	865.7
Gift card liability	95.3	214.9
Advertising fund liabilities		0.0
Current portion of long term debt and capital leases	79.6	78.2
Total current liabilities	$ 1,320.3	1,655.0
As Reported
Current assets:
Cash and cash equivalents		1,073.4
Accounts and notes receivable, net		455.9
Inventories, net		78.0
Advertising fund restricted assets		83.3
Prepaids and other current assets		59.0
Total current assets		1,749.6
Current liabilities:
Accounts and drafts payable		412.9
Other accrued liabilities		838.2
Gift card liability		214.9
Advertising fund liabilities		110.8
Current portion of long term debt and capital leases		78.2
Total current liabilities		1,655.0
Reclassification
Current assets:
Cash and cash equivalents		24.0
Accounts and notes receivable, net		32.9
Inventories, net		0.0
Advertising fund restricted assets		(83.3)
Prepaids and other current assets		26.4
Total current assets		0.0
Current liabilities:
Accounts and drafts payable		83.3
Other accrued liabilities		27.5
Gift card liability		0.0
Advertising fund liabilities		(110.8)
Current portion of long term debt and capital leases		0.0
Total current liabilities		$ 0.0