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

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Gross amount of debt extinguished.

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DEBT AND INTEREST - Other Debt Information (Details) € in Millions, $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Aug. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 EUR (€)	Dec. 31, 2020 USD ($)
Debt instrument
CARRYING VALUE	$ 5,934.5		$ 5,934.5		$ 5,934.5			$ 6,671.1
Long-term debt, current maturities	(2.7)		(2.7)		(2.7)			(1.8)
Long-term debt	5,931.8		5,931.8		5,931.8			6,669.3
Payment for Debt Extinguishment or Debt Prepayment Cost	25.0
Interest
Interest expense			78.3	$ 139.0	183.8	$ 253.4
Interest income			(1.9)	(4.2)	(10.1)	(11.6)
Interest expense, net			76.4	134.8	173.7	241.8
Debt extinguishment charges					$ (29.4)	$ (77.1)
Interest expense
Debt instrument
Debt refinancing charges, pre-tax			32.3	83.1
Debt refinancing charges, net of tax			28.4	$ 64.0
Public Notes
Debt instrument
Principal outstanding payable at time of prepayment of notes (as a percent)					101.00%
Thirty year 2011 senior notes
Debt instrument
CARRYING VALUE	384.2		384.2		$ 384.2			452.2
Aggregate principal amount	389.0		389.0		$ 389.0
Debt instrument, term					30 years
Five year 2017 senior notes
Debt instrument
CARRYING VALUE								498.6
Aggregate principal amount	500.0		$ 500.0		$ 500.0
Debt instrument, term					5 years
Debt extinguishment amount	$ 500.0
Debt Instrument, Interest Rate, Stated Percentage	2.375%		2.375%		2.375%		2.375%
Interest
Interest rate (as a percent)	2.375%		2.375%		2.375%		2.375%
Ten year 2017 senior notes
Debt instrument
CARRYING VALUE	$ 493.6		$ 493.6		$ 493.6			496.0
Aggregate principal amount	500.0		500.0		$ 500.0
Debt instrument, term					10 years
Thirty year 2017 senior notes
Debt instrument
CARRYING VALUE	424.0		424.0		$ 424.0			611.9
Aggregate principal amount	484.0		484.0		$ 484.0
Debt instrument, term					30 years
Thirty year 2020 senior notes
Debt instrument
CARRYING VALUE	490.3		490.3		$ 490.3			490.1
Aggregate principal amount	500.0		500.0		$ 500.0
Debt instrument, term					30 years
Thirty-four year 2021 senior notes
Debt instrument
CARRYING VALUE	534.9		534.9		$ 534.9
Aggregate principal amount	$ 685.0		$ 685.0		$ 685.0
Debt instrument, term					34 years
Debt Conversion, Original Debt, Amount		$ 385.0
Debt exchanged		385.0
Payment for Debt Extinguishment or Debt Prepayment Cost		118.0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		143.0
Value of notes tendered in an exchange offering		387.0
Debt Instrument, Interest Rate, Stated Percentage	2.75%		2.75%		2.75%		2.75%
Debt, unamortized discounts and financing costs		$ 143.0
Interest
Interest rate (as a percent)	2.75%		2.75%		2.75%		2.75%
Ten year 2020 senior notes
Debt instrument
CARRYING VALUE	$ 708.3		$ 708.3		$ 708.3			765.2
Aggregate principal amount	698.0		698.0		$ 698.0
Debt instrument, term					10 years
Ten year 2020 senior notes, maturing in 2031
Debt instrument
CARRYING VALUE	594.9		594.9		$ 594.9			594.4
Aggregate principal amount	600.0		600.0		$ 600.0
Debt instrument, term					10 years
Seven year 2016 senior notes
Debt instrument
CARRYING VALUE								399.0
Aggregate principal amount	400.0		$ 400.0		$ 400.0
Debt instrument, term					7 years
Debt extinguishment amount	$ 400.0
Debt Instrument, Interest Rate, Stated Percentage	3.25%		3.25%		3.25%		3.25%
Interest
Interest rate (as a percent)	3.25%		3.25%		3.25%		3.25%
Seven year 2016 senior euro notes
Debt instrument
CARRYING VALUE	$ 676.1		$ 676.1		$ 676.1			682.0
Aggregate principal amount \| €							€ 575
Debt instrument, term					7 years
Ten year 2016 senior notes
Debt instrument
CARRYING VALUE	745.9		745.9		$ 745.9			745.3
Aggregate principal amount	750.0		750.0		$ 750.0
Debt instrument, term					10 years
Thirty year 2016 senior notes
Debt instrument
CARRYING VALUE	197.1		197.1		$ 197.1			246.4
Aggregate principal amount	200.0		200.0		$ 200.0
Debt instrument, term					30 years
Ten Year 2015 senior euro notes
Debt instrument
CARRYING VALUE	676.6		676.6		$ 676.6			682.9
Aggregate principal amount \| €							€ 575
Debt instrument, term					10 years
Private Placement 34-Year 2021 Senior Notes
Debt instrument
Aggregate principal amount	300.0		300.0		$ 300.0
Other
Debt instrument
CARRYING VALUE	$ 8.6		$ 8.6		$ 8.6			$ 7.1