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Notes Payable and Long-Term Debt (Details) € in Millions	12 Months Ended
Notes Payable and Long-Term Debt (Details) € in Millions	Dec. 31, 2018 USD ($)	Dec. 31, 2018 EUR (€)	Dec. 31, 2017 USD ($)	Jul. 20, 2016 USD ($)
Debt Instrument [Line Items]
Short-term Debt, Weighted Average Interest Rate, at Point in Time	4.30%	4.30%	3.10%
Debt, Weighted Average Interest Rate	3.40%	3.40%	3.80%
Long-term Debt, by Current and Noncurrent [Abstract]
Long-term Debt	$ 2,080,500,000		$ 2,119,500,000
Current portion of long-term debt	139,800,000		15,800,000
Long-term debt, net of current portion	1,940,700,000		2,103,700,000
Long-term Debt, by Maturity [Abstract]
2019	172,600,000
2020	257,300,000
2021	1,300,000
2022	573,700,000
2023	100,000
After 2023	1,120,700,000
Total payments	2,125,700,000
Less: unamortized discounts	12,400,000
Total	2,113,300,000
Multi-currency revolving credit agreement, maximum borrowing capacity	1,500,000,000
Estimated fair value of senior unsecured notes	2,058,100,000		2,209,100,000
Debt, difference between fair value and carrying value	(7,600,000)		116,100,000
Outstanding letters of credit	42,700,000		31,400,000
Short Term Borrowings [Member]
Short-term debt
Total short-term debt	32,800,000		68,800,000
Senior Notes Due October 2019
Long-term Debt, by Current and Noncurrent [Abstract]
Long-term Debt	135,400,000		137,400,000
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]
Long-term Debt	$ 250,900,000		251,400,000
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]
Long-term Debt	$ 570,000,000		595,700,000
Debt instrument par value \| €		€ 500
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]
Long-term Debt	$ 496,600,000		496,100,000
Debt instrument par value	$ 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]
Long-term Debt	$ 119,100,000		118,900,000
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]
Long-term Debt	$ 493,700,000		493,500,000
Debt instrument par value	$ 500,000,000
Debt instrument stated interest rate	4.375%	4.375%
Debt instrument maturity period	Mar. 15, 2045
Term Loan Facilities And Other [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Long-term Debt	$ 14,800,000		26,500,000
Revolving Credit Facility [Member]
Long-term Debt, by Maturity [Abstract]
Multi-currency revolving credit agreement, current borrowing capacity	1,200,000,000
Commercial Paper [Member]
Long-term Debt, by Maturity [Abstract]
Multi-currency revolving credit agreement, current borrowing capacity	1,200,000,000
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Derivative, Notional Amount				$ 384,000,000
2016 swap termination event [Member] \| Interest Rate Swap [Member] \| Senior Notes Due October 2019
Long-term Debt, by Current and Noncurrent [Abstract]
Derivative liabilities			800,000
2016 swap termination event [Member] \| Interest Rate Swap [Member] \| Senior Notes Due September 2020
Long-term Debt, by Current and Noncurrent [Abstract]
Derivative liabilities			2,900,000
2016 swap termination event [Member] \| Unamortized portion of debt derivative [Member] \| Senior Notes Due October 2019
Long-term Debt, by Current and Noncurrent [Abstract]
Derivative assets	400,000
2016 swap termination event [Member] \| Unamortized portion of debt derivative [Member] \| Senior Notes Due September 2020
Long-term Debt, by Current and Noncurrent [Abstract]
Derivative assets	1,900,000
2009 swap termination event [Member] \| Unamortized portion of debt derivative [Member] \| Senior Notes Due October 2019
Long-term Debt, by Current and Noncurrent [Abstract]
Derivative assets	$ 1,200,000		$ 2,700,000