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DEBT AND INTEREST - Other Debt Information (Details) € in Millions, $ in Millions	1 Months Ended			3 Months Ended								12 Months Ended
	Dec. 31, 2017 USD ($)	Nov. 30, 2017 USD ($)	Aug. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 EUR (€)	Dec. 31, 2018 USD ($)
Debt instrument
CARRYING VALUE	$ 7,308.0							$ 7,308.0					$ 7,308.0			$ 6,703.0
Long-term debt, current maturities	(549.7)							(549.7)					(549.7)			(401.4)
Long-term debt	6,758.3							6,758.3					6,758.3			6,301.6
Aggregate annual maturities of long-term debt
2019																401.0
2020																301.0
2021																1,018.0
2022																497.0
2023																648.0
Interest
Interest expense												$ 237.2	274.6	$ 285.4
Interest income												(14.9)	(19.6)	(20.8)
Interest expense, net				$ 53.9	$ 55.7	$ 56.3	$ 56.4	77.8	$ 55.1	$ 59.6	$ 62.5	$ 222.3	255.0	264.6
Debt extinguishment charges													21.9
Debt extinguishment charges, after tax													13.6
Private Notes
Debt instrument
Principal outstanding payable at time of prepayment of notes (as a percent)												100.00%
Ten year 2011 senior notes
Debt instrument
CARRYING VALUE	$ 1,016.6							$ 1,016.6					$ 1,016.6			1,017.6
Aggregate principal amount																$ 1,020.0
AVERAGE INTEREST RATE (as a percent)	4.35%							4.35%					4.35%		4.35%	4.35%
EFFECTIVE INTEREST RATE (as a percent)	4.45%							4.45%					4.45%		4.43%	4.43%
Debt instrument, term												10 years
Interest rate (as a percent)	4.35%							4.35%					4.35%
Debt extinguishment amount	$ 230.0
Interest
Debt extinguishment charges	15.7
Thirty year 2011 senior notes
Debt instrument
CARRYING VALUE	$ 451.3							$ 451.3					$ 451.3			$ 451.6
Aggregate principal amount																$ 458.0
AVERAGE INTEREST RATE (as a percent)	5.50%							5.50%					5.50%		5.50%	5.50%
EFFECTIVE INTEREST RATE (as a percent)	5.60%							5.60%					5.60%		5.56%	5.56%
Debt instrument, term												30 years
Value of notes tendered in an exchange offering		$ 292.0
Five year 2017 senior notes
Debt instrument
CARRYING VALUE	$ 496.3							$ 496.3					$ 496.3			$ 496.9
Aggregate principal amount			$ 500.0													$ 500.0
AVERAGE INTEREST RATE (as a percent)	2.38%							2.38%					2.38%		2.38%	2.38%
EFFECTIVE INTEREST RATE (as a percent)	2.55%							2.55%					2.55%		2.55%	2.55%
Debt instrument, term			5 years									5 years
Interest rate (as a percent)			2.375%
Ten year 2017 senior notes
Debt instrument
CARRYING VALUE																$ 494.8
Aggregate principal amount																$ 500.0
AVERAGE INTEREST RATE (as a percent)															3.25%	3.25%
EFFECTIVE INTEREST RATE (as a percent)															3.37%	3.37%
Debt instrument, term												10 years
Thirty year 2017 senior notes
Debt instrument
CARRYING VALUE																$ 609.0
Aggregate principal amount																$ 700.0
AVERAGE INTEREST RATE (as a percent)															3.95%	3.95%
EFFECTIVE INTEREST RATE (as a percent)															4.14%	4.14%
Debt instrument, term												30 years
2017 144A notes
Debt instrument
Aggregate principal amount		825.0
Principal outstanding payable at time of prepayment of notes (as a percent)												101.00%
Ten Year 2017 144A notes
Debt instrument
CARRYING VALUE	$ 494.7							$ 494.7					$ 494.7
Aggregate principal amount		$ 500.0														$ 500.0
AVERAGE INTEREST RATE (as a percent)	3.25%							3.25%					3.25%
EFFECTIVE INTEREST RATE (as a percent)	3.36%							3.36%					3.36%
Debt instrument, term		10 years										10 years
Interest rate (as a percent)		3.25%
Thirty Year 2017 144A notes
Debt instrument
CARRYING VALUE	$ 607.8							$ 607.8					$ 607.8
Aggregate principal amount		$ 325.0														700.0
AVERAGE INTEREST RATE (as a percent)	3.95%							3.95%					3.95%
EFFECTIVE INTEREST RATE (as a percent)	4.14%							4.14%					4.14%
Debt instrument, term		30 years										30 years
Interest rate (as a percent)		3.95%
Debt exchanged		$ 375.0
Debt, unamortized discounts and financing costs	$ 87.0							$ 87.0					$ 87.0
Three year 2016 senior notes
Debt instrument
CARRYING VALUE	$ 396.1							$ 396.1					$ 396.1			399.7
Aggregate principal amount																$ 400.0
AVERAGE INTEREST RATE (as a percent)	2.00%							2.00%					2.00%		2.00%	2.00%
EFFECTIVE INTEREST RATE (as a percent)	2.26%							2.26%					2.26%		3.24%	3.24%
Debt instrument, term												3 years
Seven year 2016 senior Notes
Debt instrument
CARRYING VALUE	$ 397.5							$ 397.5					$ 397.5			$ 398.0
Aggregate principal amount																$ 400.0
AVERAGE INTEREST RATE (as a percent)	3.25%							3.25%					3.25%		3.25%	3.25%
EFFECTIVE INTEREST RATE (as a percent)	3.49%							3.49%					3.49%		3.49%	3.49%
Debt instrument, term												7 years
Seven year 2016 senior euro notes
Debt instrument
CARRYING VALUE	$ 676.6							$ 676.6					$ 676.6			$ 644.1
Aggregate principal amount \| €															€ 575
AVERAGE INTEREST RATE (as a percent)	1.00%							1.00%					1.00%		1.00%	1.00%
EFFECTIVE INTEREST RATE (as a percent)	1.17%							1.17%					1.17%		1.09%	1.09%
Debt instrument, term												7 years
Ten year 2016 senior notes
Debt instrument
CARRYING VALUE	$ 742.8							$ 742.8					$ 742.8			$ 743.8
Aggregate principal amount																$ 750.0
AVERAGE INTEREST RATE (as a percent)	2.70%							2.70%					2.70%		2.70%	2.70%
EFFECTIVE INTEREST RATE (as a percent)	2.93%							2.93%					2.93%		2.93%	2.93%
Debt instrument, term												10 years
Thirty year 2016 senior notes
Debt instrument
CARRYING VALUE	$ 246.0							$ 246.0					$ 246.0			$ 246.1
Aggregate principal amount																$ 250.0
AVERAGE INTEREST RATE (as a percent)	3.70%							3.70%					3.70%		3.70%	3.70%
EFFECTIVE INTEREST RATE (as a percent)	3.76%							3.76%					3.76%		3.76%	3.76%
Debt instrument, term												30 years
Three year 2015 senior notes
Debt instrument
CARRYING VALUE	$ 299.9							$ 299.9					$ 299.9
Aggregate principal amount																$ 0.0
AVERAGE INTEREST RATE (as a percent)	1.55%							1.55%					1.55%
EFFECTIVE INTEREST RATE (as a percent)	1.94%							1.94%					1.94%
Debt instrument, term												3 years
Five year 2015 senior notes
Debt instrument
CARRYING VALUE	$ 299.1							$ 299.1					$ 299.1			299.5
Aggregate principal amount																$ 300.0
AVERAGE INTEREST RATE (as a percent)	2.25%							2.25%					2.25%		2.25%	2.25%
EFFECTIVE INTEREST RATE (as a percent)	2.79%							2.79%					2.79%		2.79%	2.79%
Debt instrument, term												5 years
Ten Year 2015 senior euro notes
Debt instrument
CARRYING VALUE	$ 679.4							$ 679.4					$ 679.4			$ 646.3
Aggregate principal amount \| €															€ 575
AVERAGE INTEREST RATE (as a percent)	2.63%							2.63%					2.63%		2.63%	2.63%
EFFECTIVE INTEREST RATE (as a percent)	2.85%							2.85%					2.85%		2.94%	2.94%
Debt instrument, term												10 years
Series A private placement senior notes due 2018
Debt instrument
CARRYING VALUE	$ 248.5							$ 248.5					$ 248.5
Aggregate principal amount	$ 250.0							$ 250.0					$ 250.0	250.0
AVERAGE INTEREST RATE (as a percent)	3.69%							3.69%					3.69%
EFFECTIVE INTEREST RATE (as a percent)	5.16%							5.16%					5.16%
Series B private placement senior notes due 2023
Debt instrument
CARRYING VALUE	$ 249.3							$ 249.3					$ 249.3			$ 249.4
Aggregate principal amount	$ 250.0							$ 250.0					$ 250.0	$ 250.0
AVERAGE INTEREST RATE (as a percent)	4.32%							4.32%					4.32%		4.32%	4.32%
EFFECTIVE INTEREST RATE (as a percent)	4.36%							4.36%					4.36%		4.36%	4.36%
Other
Debt instrument
CARRYING VALUE	$ 6.1							$ 6.1					$ 6.1			$ 6.2