Notes Payable and Long-Term Debt (Details) € in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2015 EUR (€)	Mar. 16, 2015 USD ($)	Dec. 31, 2014 USD ($)	Mar. 12, 2014 USD ($)
Debt Instrument [Line Items]
Short-term Debt, Weighted Average Interest Rate	1.30%	1.30%		0.80%
Debt, Weighted Average Interest Rate	3.60%	3.60%		2.90%
Long-term Debt, by Current and Noncurrent [Abstract]
Total long-term debt	$ 2,285,400,000			$ 738,800,000
Current portion of long-term debt	160,800,000			22,500,000
Long-term debt, net of current portion	2,124,600,000			716,300,000
Long-term Debt, by Maturity [Abstract]
2016	441,500,000
2017	49,900,000
2018	13,900,000
2019	134,100,000
2020	259,900,000
After 2020	1,674,000,000
Total payments	2,573,300,000
Less: unamortized discounts	7,200,000
Total	2,566,100,000
Multi-currency revolving credit agreement, maximum borrowing capacity	1,250,000,000
Estimated fair value of senior unsecured notes	2,197,600,000			750,300,000
Fair value higher than carrying value for senior unsecured notes	7,200,000			98,700,000
Outstanding letters of credit	29,300,000			28,300,000
Short Term Borrowings [Member]
Short-term debt
Total short-term debt	280,700,000			601,200,000
Senior Notes Due November 2016
Long-term Debt, by Current and Noncurrent [Abstract]
Total long-term debt	149,900,000			149,800,000
Debt instrument par value	$ 150,000,000
Debt instrument stated interest rate	5.75%	5.75%
Debt instrument maturity period	Nov. 01, 2016
Senior Notes Due October 2019
Long-term Debt, by Current and Noncurrent [Abstract]
Total long-term debt	$ 134,000,000			134,000,000
Debt instrument par value	$ 134,000,000
Debt instrument stated interest rate	8.00%	8.00%
Debt instrument maturity period	Oct. 01, 2019
Senior Notes Due September 2020
Long-term Debt, by Current and Noncurrent [Abstract]
Total long-term debt	$ 248,600,000			248,400,000
Debt instrument par value	$ 250,000,000
Debt instrument stated interest rate	4.625%	4.625%
Debt instrument maturity period	Sep. 15, 2020
Senior Notes Due November 2022
Long-term Debt, by Current and Noncurrent [Abstract]
Total long-term debt	$ 540,900,000
Debt instrument par value		€ 500	$ 500,000,000
Debt instrument stated interest rate	1.80%	1.80%
Debt instrument maturity period	Nov. 07, 2022
Senior Notes Due March 2025
Long-term Debt, by Current and Noncurrent [Abstract]
Total long-term debt	$ 499,100,000
Debt instrument par value	$ 500,000,000		500,000,000
Debt instrument stated interest rate	3.375%	3.375%
Debt instrument maturity period	Mar. 15, 2025
Senior Notes Due February 2029
Long-term Debt, by Current and Noncurrent [Abstract]
Total long-term debt	$ 119,500,000			119,400,000
Debt instrument par value	$ 121,000,000
Debt instrument stated interest rate	7.125%	7.125%
Debt instrument maturity period	Feb. 15, 2029
Senior Notes Due March 2045
Long-term Debt, by Current and Noncurrent [Abstract]
Total long-term debt	$ 498,400,000
Debt instrument par value	$ 500,000,000		$ 500,000,000
Debt instrument stated interest rate	4.375%	4.375%
Debt instrument maturity period	Mar. 15, 2045
Multi Currency Revolving Credit Facility [Member]
Long-term Debt, by Maturity [Abstract]
Multi-currency revolving credit agreement, maximum borrowing capacity	$ 1,000,000,000
Commercial Paper [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Total long-term debt	215,000,000			460,900,000
Long-term Debt, by Maturity [Abstract]
Multi-currency revolving credit agreement, current borrowing capacity					$ 1,000,000,000.0
Term Loan Facilities And Other [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Total long-term debt	89,700,000			75,100,000
Unamortized portion of debt derivative [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Total long-term debt	5,300,000			$ 12,100,000
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Derivative, Notional Amount	$ 384,000,000