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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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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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Contractual interest rate for funds borrowed, under the debt agreement.

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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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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Repayments of securitizations of receivables treated as collateralized borrowings, which are classified as financing transactions.

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Debt (Details) $ / shares in Units, € in Millions, $ in Millions	1 Months Ended		3 Months Ended	9 Months Ended		12 Months Ended
	Dec. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2018 EUR (€) item agreement	Sep. 30, 2018 USD ($) item agreement	Dec. 31, 2017 USD ($)	Sep. 30, 2018 USD ($) item $ / shares	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 USD ($)	Nov. 30, 2017 USD ($)	Sep. 30, 2017 EUR (€)	Sep. 30, 2017 USD ($)	Mar. 31, 2017 EUR (€)	Mar. 31, 2017 USD ($)
Debt Instrument
Total long-term debt							$ 5,508.0		$ 5,132.0			$ 5,426.0
Less amounts due within one year							21.0		11.0			48.0
Long-term debt							5,487.0		5,121.0			5,378.0
Unused Credit							$ 653.0
Number financial maintenance covenants \| agreement				1	1
Leverage Ratio \| item				4.5			4.5
Accounts receivable securitization
Short-term loans and long-term debt due within one year							$ 152.0		162.0			243.0
Weighted average interest rate, short-term debt (as a percent)				3.40%			3.40%
Maximum
Debt Instrument
Maximum Leverage Ratio may increase \| item				0.5	0.5
Maximum Borrowing Capacity							$ 1,910.0
Prior Agreement
Debt Instrument
Interest charges for write-off of finance fees			$ 11.0
Secured Credit Agreement \| Minimum
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%	0.00%
Secured Credit Agreement \| Maximum
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%	0.50%
Revolving Loans
Debt Instrument
Total long-term debt							$ 335.0
Revolving Loans \| Prior Agreement
Debt Instrument
Total long-term debt												200.0
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			1,202.0
Term Loan A (279 million EUR) \| Prior Agreement
Debt Instrument
Total long-term debt											€ 279	308.0
Other secured debt
Debt Instrument
Total long-term debt							329.0
Senior Notes 6.75%, due 2020 (500 million EUR)
Debt Instrument
Total long-term debt				€ 500			$ 580.0	€ 500	594.0		500	586.0
Interest rate, stated percentage				6.75%			6.75%
Fair values of fixed rate debt obligations
Principal Amount							$ 582.0
Indicated Market Price (in dollars per share) \| $ / shares							$ 113.10
Fair Value							$ 658.0
Senior Notes 4.875%, due 2021 (330 million EUR)
Debt Instrument
Total long-term debt				€ 330			$ 382.0	€ 330	392.0		330	386.0
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							$ 111.05
Fair Value							$ 426.0
Senior Notes 5.00%, due 2022
Debt Instrument
Total long-term debt							$ 497.0		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							$ 100.93
Fair Value							$ 505.0
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							$ 95.57
Fair Value							$ 296.0
Senior Notes 5.875%, due 2023
Debt Instrument
Total long-term debt							$ 687.0		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							$ 103.08
Fair Value							$ 722.0
Senior Notes 3.125%, due 2024 (725 million EUR)
Debt Instrument
Total long-term debt				€ 725			$ 828.0	€ 725	$ 849.0		€ 725	840.0
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							$ 844.0
Indicated Market Price (in dollars per share) \| $ / shares							$ 103.40
Fair Value							$ 873.0
Senior Notes 6.375%, due 2025
Debt Instrument
Total long-term debt							$ 295.0		$ 295.0			295.0
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							$ 103.88
Fair Value							$ 312.0
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							$ 98.90
Fair Value							$ 297.0
Senior Debentures 7.80%, due 2018
Debt Instrument
Total long-term debt										$ 22.0		22.0
Interest rate, stated percentage				7.80%			7.80%			7.80%
Face Value														$ 228.0
Interest charges for write-off of finance fees						$ 18.0
Capital leases
Debt Instrument
Total long-term debt							$ 48.0		54.0			54.0
Other
Debt Instrument
Total long-term debt							16.0		$ 17.0			$ 56.0
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%	2.00%
Revolving Credit Facility \| Minimum
Debt Instrument
Facility fee payable (as a percent)				0.20%	0.20%
Revolving Credit Facility \| Maximum
Debt Instrument
Facility fee payable (as a percent)				0.30%	0.30%
Multicurrency Revolving Credit Facility
Debt Instrument
Total long-term debt							$ 700.0
European Accounts Receivable Securitization Program
Debt Instrument
Termination of accounts receivable securitization \| €				€ 185