Variable Interest Entities (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Variable Interest Entity [Line Items]
Total assets	$ 8,546.4	$ 4,547.3
Variable Interest Entity, Primary Beneficiary [Member] | Subsidiaries [Member]
Variable Interest Entity [Line Items]
Interest in entity	45.00%
Variable Interest Entity, Primary Beneficiary [Member] | Saphyto S.A. [Member]
Variable Interest Entity [Line Items]
Equity of equity method investee	$ 4.1
Equity Method Investment, Summarized Financial Information, Noncurrent Liabilities	1.0
Total assets	$ 14.6
Variable Interest Entity, Primary Beneficiary [Member] | Saphyto S.A. [Member] | Sale Of Platform Products [Member] | Product Concentration Risk [Member]
Variable Interest Entity [Line Items]
Percentage of sales that are Platform products	94.00%
Variable Interest Entity, Not Primary Beneficiary [Member] | Minority Shareholder Of SPIA [Member]
Variable Interest Entity [Line Items]
Interest in entity	50.90%
Variable Interest Entity, Not Primary Beneficiary [Member] | SPIA [Member]
Variable Interest Entity [Line Items]
Ownership percentage of equity investment	31.95%
Equity of equity method investee	$ 4.3
Equity method investment on balance sheet	1.3
Total assets	$ 4.3
Variable Interest Entity, Not Primary Beneficiary [Member] | SPIA [Member] | Sale Of Platform Products [Member] | Product Concentration Risk [Member]
Variable Interest Entity [Line Items]
Percentage of sales that are Platform products	90.00%