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Debt and Credit Arrangements Debt Transactions (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Debt Instrument [Line Items]
Gain (Loss) on Extinguishment of Debt	$ 0	$ 0	$ (74,000,000.0)	$ 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	300,000	$ (600,000)	(4,900,000)	$ (1,200,000)
4.750% Notes Due 2030 (less unamortized discount and issuance costs of $3.4 and $5.4, respectively)
Debt Instrument [Line Items]
Par Value	$ 650,000,000.0		$ 650,000,000.0
Debt Instrument, Interest Rate, Stated Percentage	4.75%		4.75%
4.000% Notes Due 2022
Debt Instrument [Line Items]
Par Value	$ 250,000,000.0		$ 250,000,000.0
Debt Instrument, Interest Rate, Stated Percentage	4.00%		4.00%
Gain (Loss) on Extinguishment of Debt			$ 9,200,000
Redemption Premium			8,600,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	$ 600,000		600,000
Payment for Debt Extinguishment or Debt Prepayment Cost			258,900,000
4.200% Notes Due 2024 (less unamortized discount and issuance costs of $0.1 and $0.6, respectively)
Debt Instrument [Line Items]
Par Value	500,000,000.0		500,000,000.0
Unsecured Debt 3.75% Note Due in 2021 [Member]
Debt Instrument [Line Items]
Par Value	$ 500,000,000.0		$ 500,000,000.0
Debt Instrument, Interest Rate, Stated Percentage	3.75%		3.75%
Unsecured Debt 2.400% Note [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.40%		2.40%
Unsecured Debt	$ 494,500,000		$ 494,500,000
Debt Instrument, Unamortized Discount	800,000		800,000
Debt Issuance Costs, Gross	4,700,000		4,700,000
Unsecured Debt 4.65% Notes [Member]
Debt Instrument [Line Items]
Par Value	$ 500,000,000.0		$ 500,000,000.0
Debt Instrument, Interest Rate, Stated Percentage	4.65%		4.65%
Unsecured Debt 5.40% Notes [Member]
Debt Instrument [Line Items]
Par Value	$ 500,000,000.0		$ 500,000,000.0
Debt Instrument, Interest Rate, Stated Percentage	5.40%		5.40%
2.400% Notes Due 2031 (less unamortized discount and issuance costs of $0.8 and $4.5, respectively)
Debt Instrument [Line Items]
Par Value	$ 500,000,000.0		$ 500,000,000.0
3.750% Notes Due 2023
Debt Instrument [Line Items]
Par Value	$ 500,000,000.0		$ 500,000,000.0
Debt Instrument, Interest Rate, Stated Percentage	3.75%		3.75%
Gain (Loss) on Extinguishment of Debt			$ 36,500,000
Redemption Premium			30,700,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	$ 1,100,000		1,100,000
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax			4,700,000
Payment for Debt Extinguishment or Debt Prepayment Cost			532,900,000
Unsecured Debt 3.375% Note
Debt Instrument [Line Items]
Par Value	$ 500,000,000.0		$ 500,000,000.0
Debt Instrument, Interest Rate, Stated Percentage	3.375%		3.375%
Unsecured Debt	$ 493,100,000		$ 493,100,000
Debt Instrument, Unamortized Discount	1,100,000		1,100,000
Debt Issuance Costs, Gross	5,800,000		5,800,000
Unsecured Debt 4.200% Notes Remaining Principal
Debt Instrument [Line Items]
Par Value	$ 250,000,000.0		$ 250,000,000.0
Debt Instrument, Interest Rate, Stated Percentage	4.20%		4.20%
Gain (Loss) on Extinguishment of Debt			$ 28,300,000
Redemption Premium			27,500,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	$ 800,000		800,000
Payment for Debt Extinguishment or Debt Prepayment Cost			$ 282,200,000

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