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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Notes Payable and Long-Term Debt (Details)	6 Months Ended	12 Months Ended
Notes Payable and Long-Term Debt (Details)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2018 EUR (€)	Dec. 31, 2017 EUR (€)	Jul. 20, 2016 USD ($)
Long-term debt
Long-term Debt	$ 2,105,300,000	$ 2,119,500,000
Current portion of long-term debt	2,800,000	15,800,000
Long-term debt, net of current portion	$ 2,102,500,000	$ 2,103,700,000
Short-term Debt, Weighted Average Interest Rate, at Point in Time	3.20%	3.10%	3.20%	3.10%
Debt weighted average interest rate	3.40%	3.80%	3.40%	3.80%
Maximum borrowing capacity	$ 1,500,000,000
Estimated fair value of senior unsecured notes	2,153,800,000	$ 2,209,100,000
Fair value higher than carrying value for senior unsecured notes	77,200,000	116,100,000
Letters of Credit Outstanding, Amount	29,300,000	31,400,000
Short Term Borrowings [Member]
Short-term debt
Short-term borrowings	67,700,000	68,800,000
8.00% Senior Notes [Member]
Long-term debt
Long-term Debt	136,400,000	137,400,000
Debt instrument par value	$ 134,000,000	$ 134,000,000
Debt instrument stated interest rate	8.00%	8.00%	8.00%	8.00%
Debt instrument maturity date	Oct. 01, 2019	Oct. 01, 2019
4.625% Senior Notes [Member]
Long-term debt
Long-term Debt	$ 251,200,000	$ 251,400,000
Debt instrument par value	$ 250,000,000	$ 250,000,000
Debt instrument stated interest rate	4.625%	4.625%	4.625%	4.625%
Debt instrument maturity date	Sep. 15, 2020	Sep. 15, 2020
1.80% Senior Notes [Member]
Long-term debt
Long-term Debt	$ 580,100,000	$ 595,700,000
Debt instrument par value \| €			€ 500,000,000	€ 500,000,000
Debt instrument stated interest rate	1.80%	1.80%	1.80%	1.80%
Debt instrument maturity date	Nov. 07, 2022	Nov. 07, 2022
3.375% Senior Notes [Member]
Long-term debt
Long-term Debt	$ 496,300,000	$ 496,100,000
Debt instrument par value	$ 500,000,000	$ 500,000,000
Debt instrument stated interest rate	3.375%	3.375%	3.375%	3.375%
Debt instrument maturity date	Mar. 15, 2025	Mar. 15, 2025
7.125% Senior Notes [Member]
Long-term debt
Long-term Debt	$ 119,000,000	$ 118,900,000
Debt instrument par value	$ 121,000,000	$ 121,000,000
Debt instrument stated interest rate	7.125%	7.125%	7.125%	7.125%
Debt instrument maturity date	Feb. 15, 2029	Feb. 15, 2029
4.375% Senior Notes [Member]
Long-term debt
Long-term Debt	$ 493,600,000	$ 493,500,000
Debt instrument par value	$ 500,000,000	$ 500,000,000
Debt instrument stated interest rate	4.375%	4.375%	4.375%	4.375%
Debt instrument maturity date	Mar. 15, 2045	Mar. 15, 2045
Revolving Credit Facility [Member]
Long-term debt
Current borrowing capacity	$ 1,200,000,000
Term Loan Facilities And Other [Member]
Long-term debt
Long-term Debt	28,700,000	$ 26,500,000
Interest rate swaps
Long-term debt
Derivative, Notional Amount					$ 384,000,000
Commercial Paper [Member]
Long-term debt
Current borrowing capacity	1,200,000,000.0
2016 swap termination event [Member] \| Unamortized portion of interest rate swap \| 8.00% Senior Notes [Member]
Long-term debt
Derivative assets	600,000	800,000
2016 swap termination event [Member] \| Unamortized portion of interest rate swap \| 4.625% Senior Notes [Member]
Long-term debt
Derivative assets	2,400,000	2,900,000
2009 swap termination event [Member] \| Unamortized portion of interest rate swap \| 8.00% Senior Notes [Member]
Long-term debt
Derivative assets	$ 1,900,000	$ 2,700,000