Balance Sheet Components (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Restricted cash	$ 107.1	$ 106.6
Other current liabilities
Schedule of Equity Method Investments [Line Items]
Other current liabilities, contingent consideration	35.0	35.0
Other long-term obligations
Schedule of Equity Method Investments [Line Items]
Other current liabilities, contingent consideration	500.8	491.4
Other assets
Schedule of Equity Method Investments [Line Items]
Restricted cash, noncurrent	$ 100.0	$ 100.0