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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Debt (Details) $ / shares in Units, € in Millions, $ in Millions	1 Months Ended		3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2018 USD ($) item agreement	Dec. 31, 2017 USD ($)	Jun. 30, 2018 EUR (€) item	Jun. 30, 2018 USD ($) item $ / shares	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 USD ($)	Nov. 30, 2017 USD ($)	Jun. 30, 2017 EUR (€)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 EUR (€)	Mar. 31, 2017 USD ($)
Debt Instrument
Total long-term debt							$ 5,398.0		$ 5,132.0			$ 5,518.0
Less amounts due within one year							21.0		11.0			47.0
Long-term debt							5,377.0		5,121.0			5,471.0
Unused Credit							$ 591.0
Number financial maintenance covenants \| agreement				1
Leverage Ratio \| item						4.5	4.5
Accounts receivable securitization
Short-term loans and long-term debt due within one year							$ 291.0		162.0			271.0
Weighted average interest rate, short-term debt (as a percent)						3.18%	3.18%
Prior Agreement
Debt Instrument
Interest charges for write-off of finance fees			$ 11.0
Revolving Loans
Debt Instrument
Total long-term debt							$ 397.0
Revolving Loans \| Prior Agreement
Debt Instrument
Total long-term debt												209.0
Term Loan A
Debt Instrument
Total long-term debt							908.0
Face Value							910.0
Net proceeds, after deducting debt issuance costs				$ 908.0
Term Loan A \| Prior Agreement
Debt Instrument
Total long-term debt									1,148.0			1,370.0
Term Loan A (279 million EUR) \| Prior Agreement
Debt Instrument
Total long-term debt						€ 279						303.0
Senior Notes 6.75%, due 2020 (500 million EUR)
Debt Instrument
Total long-term debt						€ 500	$ 580.0	€ 500	594.0		€ 500	569.0
Interest rate, stated percentage						6.75%	6.75%
Fair values of fixed rate debt obligations
Principal Amount							$ 583.0
Indicated Market Price (in dollars per share) \| $ / shares							$ 113.13
Fair Value							$ 660.0
Senior Notes 4.875%, due 2021 (330 million EUR)
Debt Instrument
Total long-term debt						€ 330	$ 383.0		392.0			375.0
Interest rate, stated percentage						4.875%	4.875%
Fair values of fixed rate debt obligations
Principal Amount							$ 384.0
Indicated Market Price (in dollars per share) \| $ / shares							$ 110.13
Fair Value							$ 423.0
Senior Notes 5.00%, due 2022
Debt Instrument
Total long-term debt							$ 496.0		496.0			496.0
Interest rate, stated percentage						5.00%	5.00%
Fair values of fixed rate debt obligations
Principal Amount							$ 500.0
Indicated Market Price (in dollars per share) \| $ / shares							$ 99.72
Fair Value							$ 499.0
Senior Notes 4.00%, due 2023
Debt Instrument
Total long-term debt							$ 306.0		$ 305.0
Interest rate, stated percentage						4.00%	4.00%	4.00%	4.00%
Face Value									$ 310.0
Net proceeds, after deducting debt issuance costs	$ 305.0
Fair values of fixed rate debt obligations
Principal Amount							$ 310.0
Indicated Market Price (in dollars per share) \| $ / shares							$ 93.65
Fair Value							$ 290.0
Senior Notes 5.875%, due 2023
Debt Instrument
Total long-term debt							$ 686.0		685.0			684.0
Interest rate, stated percentage						5.875%	5.875%
Fair values of fixed rate debt obligations
Principal Amount							$ 700.0
Indicated Market Price (in dollars per share) \| $ / shares							$ 101.63
Fair Value							$ 711.0
Senior Notes 3.125%, due 2024 (725 million EUR)
Debt Instrument
Total long-term debt						€ 725	$ 833.0		$ 849.0			819.0
Interest rate, stated percentage						3.125%	3.125%	3.125%	3.125%				3.125%	3.125%
Face Value \| €													€ 225
Net proceeds, after deducting debt issuance costs		$ 237.0
Fair values of fixed rate debt obligations
Principal Amount							$ 845.0
Indicated Market Price (in dollars per share) \| $ / shares							$ 101.27
Fair Value							$ 856.0
Senior Notes 6.375%, due 2025
Debt Instrument
Total long-term debt							$ 295.0		$ 295.0			294.0
Interest rate, stated percentage						6.375%	6.375%
Fair values of fixed rate debt obligations
Principal Amount							$ 300.0
Indicated Market Price (in dollars per share) \| $ / shares							$ 103.31
Fair Value							$ 310.0
Senior Notes, 5.375% due 2025
Debt Instrument
Total long-term debt							$ 297.0		297.0			297.0
Interest rate, stated percentage						5.375%	5.375%
Fair values of fixed rate debt obligations
Principal Amount							$ 300.0
Indicated Market Price (in dollars per share) \| $ / shares							$ 101.63
Fair Value							$ 305.0
Senior Debentures 7.80%, due 2018
Debt Instrument
Total long-term debt										$ 22.0		22.0
Interest rate, stated percentage						7.80%	7.80%
Face Value														$ 228.0
Interest charges for write-off of finance fees					$ 18.0
Capital leases
Debt Instrument
Total long-term debt							$ 50.0		54.0			58.0
Other
Debt Instrument
Total long-term debt							167.0		17.0			22.0
Revolving Credit Facility
Debt Instrument
Total long-term debt							300.0
Additional default interest rate per annum applied to all obligations owed under the Agreement				2.00%
Multicurrency Revolving Credit Facility
Debt Instrument
Total long-term debt							700.0
Accounts Receivable Securitization Program
Accounts receivable securitization
Short-term loans and long-term debt due within one year							$ 147.0		$ 133.0			$ 182.0
Weighted average interest rate, short-term debt (as a percent)						0.98%	0.98%	0.76%	0.76%		0.74%	0.74%
European Accounts Receivable Securitization Program
Debt Instrument
Maximum Borrowing Capacity \| €						€ 185
Minimum \| Secured Credit Agreement
Debt Instrument
Interest rate margin, Eurocurrency Rate loans (as a percent)						1.00%	1.00%
Interest rate margin, Base Rate loans (as a percent)				0.00%
Minimum \| Revolving Credit Facility
Debt Instrument
Facility fee payable (as a percent)				0.20%
Maximum
Debt Instrument
Maximum Borrowing Capacity							$ 1,910.0
Maximum \| Secured Credit Agreement
Debt Instrument
Interest rate margin, Eurocurrency Rate loans (as a percent)						1.50%	1.50%
Interest rate margin, Base Rate loans (as a percent)				0.50%
Maximum \| Revolving Credit Facility
Debt Instrument
Maximum Leverage Ratio may increase \| item				0.5
Facility fee payable (as a percent)				0.30%