Balance Sheet Components (Other Long-term Obligations) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Schedule of Other Noncurrent Liabilities [Line Items]
Employee benefit liabilities	$ 411.7	$ 408.2
Contingent consideration	418.8	453.7
Tax related items, including contingencies	155.6	237.7
Other	237.4	132.1
Other long-term obligations	1,151.6	1,235.7
Clean energy investments
Schedule of Other Noncurrent Liabilities [Line Items]
Other long-term obligations	151.4	171.8
Other long-term obligations
Schedule of Other Noncurrent Liabilities [Line Items]
Contingent consideration	$ 195.5	$ 285.9