Equity Method Investments (Balance Sheet Table) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Investments in subsidiaries	$ 0.0	$ 0.0
Other assets | Agila Specialties
Schedule of Equity Method Investments [Line Items]
Investments in subsidiaries	80.0	96.2
Clean energy investments | Other assets
Schedule of Equity Method Investments [Line Items]
Investments in subsidiaries	337.6	379.3
Clean energy investments | Total liabilities
Schedule of Equity Method Investments [Line Items]
Investments in subsidiaries	382.0	419.3
Clean energy investments | Other current liabilities
Schedule of Equity Method Investments [Line Items]
Investments in subsidiaries	64.1	62.3
Clean energy investments | Other long-term obligations
Schedule of Equity Method Investments [Line Items]
Investments in subsidiaries	$ 317.9	$ 357.0