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Notes Payable and Long-Term Debt (Details)	6 Months Ended
Notes Payable and Long-Term Debt (Details)	Jun. 30, 2016 USD ($)	Jun. 30, 2016 EUR (€)	Dec. 31, 2015 USD ($)
Long-term debt
Long-term Debt	$ 2,283,400,000		$ 2,269,600,000
Current portion of long-term debt	163,900,000		160,700,000
Long-term debt, net of current portion	$ 2,119,500,000		$ 2,108,900,000
Short-term Debt, Weighted Average Interest Rate			1.30%
Debt weighted average interest rate	3.50%	3.50%	3.60%
Maximum borrowing capacity	$ 1,250,000,000
Estimated fair value of senior unsecured notes	2,344,900,000		$ 2,197,600,000
Fair value higher than carrying value for senior unsecured notes	142,300,000		17,700,000
Letters of Credit Outstanding, Amount	35,200,000		29,300,000
8.00% Senior Notes [Member]
Long-term debt
Long-term Debt	140,800,000		138,500,000
Debt instrument par value	$ 134,000,000
Debt instrument stated interest rate	8.00%	8.00%
Debt instrument maturity date	Oct. 01, 2019
4.625% Senior Notes [Member]
Long-term debt
Long-term Debt	$ 254,000,000		245,600,000
Debt instrument par value	$ 250,000,000
Debt instrument stated interest rate	4.625%	4.625%
Debt instrument maturity date	Sep. 15, 2020
1.80% Senior Notes [Member]
Long-term debt
Long-term Debt	$ 549,600,000		536,800,000
Debt instrument par value \| €		€ 500,000,000
Debt instrument stated interest rate	1.80%	1.80%
Debt instrument maturity date	Nov. 07, 2022
5.75% Senior Notes [Member]
Long-term debt
Long-term Debt	$ 150,900,000		152,200,000
Debt instrument par value	$ 150,000,000
Debt instrument stated interest rate	5.75%	5.75%
Debt instrument maturity date	Nov. 01, 2016
3.375% Senior Notes [Member]
Long-term debt
Long-term Debt	$ 495,300,000		495,100,000
Debt instrument par value	$ 500,000,000
Debt instrument stated interest rate	3.375%	3.375%
Debt instrument maturity date	Mar. 15, 2025
7.125% Senior Notes [Member]
Long-term debt
Long-term Debt	$ 118,800,000		118,700,000
Debt instrument par value	$ 121,000,000
Debt instrument stated interest rate	7.125%	7.125%
Debt instrument maturity date	Feb. 15, 2029
4.375% Senior Notes [Member]
Long-term debt
Long-term Debt	$ 493,200,000		493,000,000
Debt instrument par value	$ 500,000,000
Debt instrument stated interest rate	4.375%	4.375%
Debt instrument maturity date	Mar. 15, 2045
Revolving Credit Facility [Member]
Long-term debt
Long-term Debt	$ 0
Current borrowing capacity	1,000,000,000
Term Loan Facilities And Other [Member]
Long-term debt
Long-term Debt	80,800,000		89,700,000
Commercial Paper [Member]
Short-term debt
Short-term borrowings	270,000,000		215,000,000
Long-term debt
Current borrowing capacity	1,000,000,000.0
Short Term Borrowings [Member]
Short-term debt
Short-term borrowings	351,400,000		280,700,000
Interest rate swaps
Long-term debt
Derivative, Notional Amount	384,000,000
Interest rate swaps \| 8.00% Senior Notes [Member]
Long-term debt
Derivative assets	2,300,000
Derivative liabilities			800,000
Interest rate swaps \| 4.625% Senior Notes [Member]
Long-term debt
Derivative assets	6,300,000
Derivative liabilities			1,900,000
Unamortized portion of interest rate swap \| 8.00% Senior Notes [Member]
Long-term debt
Long-term Debt	4,800,000		5,500,000
Unamortized portion of interest rate swap \| 5.75% Senior Notes [Member]
Long-term debt
Long-term Debt	$ 1,000,000		$ 2,400,000