Financial Instruments (Interest Rate and Credit Risks) (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($) customer	Feb. 11, 2015 USD ($)	Dec. 12, 2014 USD ($)	Sep. 30, 2014 USD ($)	Nov. 11, 2013 USD ($)
Interest rate risk
Average interest rate received on cash and liquid investments	less than 1% per annum.
Line of Credit Facility [Line Items]
Interest rate risk exposure	The Company has evaluated the interest rate risk on the Credit lines, the RCF and the 2015 Facilitiy Agreement and considers the risks associated with floating interest rates on borrowings under its facilities as appropriate. A hypothetical one percentage point increase or decrease in the interest rates applicable to drawings under the Credit lines, the 2015 Facility Agreement and RCF at September 30, 2015 would increase interest expense by approximately $20 million per annum and would decrease the interest expense by approximately $4 million per annum.
Short-term borrowings	$ 2,005.7	$ 850.0
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of major external customers | customer		3
Customer concentration risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage		47.00%
Revolving Credit Facility
Line of Credit Facility [Line Items]
Short-term borrowings	1,245.0	$ 0.0
Principal amount				$ 2,100.0
2013 Facilities Agreement
Line of Credit Facility [Line Items]
Facilitiy agreement total amount						$ 2,600.0
Short-term borrowings	0.0	850.0
2015 Facility Agreement
Line of Credit Facility [Line Items]
Facilitiy agreement total amount	750.0		$ 850.0		$ 750.0
Short-term borrowings	750.0	$ 0.0
Government-owned or Supported Healthcare Providers | Italy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable received	65.7
Government-owned or Supported Healthcare Providers | Spain
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable received	$ 80.6