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Financing Arrangements - Long-term debt - Stated value (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021		Dec. 31, 2020
Stated interest rates:
Long-term debt, prepayment	$ 450.0
Long-term Debt, Excluding Current Maturities
Stated value of issued debt	3,975.0		$ 4,570.4
Fair value adjustment of debt	10.4		12.9
Debt Instrument, Unamortized Discount	6.6		5.3
Total long term debt	3,978.8		4,578.0
Stated value of current portion of issued debt	594.8		502.9
Fair value adjustment of current portion of long-term debt	2.3		2.3
Debt Instrument, Unamortized Discount, Current	0.5		1.0
Carrying Value, current portion	596.6		504.2
Stated value of noncurrent portion of issued debt	3,380.2		4,067.5
Fair Market Value Adjustment, Total long term debt noncurrent	8.1		10.6
Debt Instrument, Unamortized Discount, Noncurrent	6.1		4.3
Total long-term debt, less current maturities	3,382.2		4,073.8
Maturities of Long-term Debt
2022	596.6
2023	996.2
2024	103.1
2025	15.7
2026	15.7
Thereafter	2,251.5
Total long term debt	$ 3,978.8		4,578.0
Senior Notes | Senior Notes Due 2022 [Member]
Stated interest rates:
Stated interest rate	3.25%
Long term debt including current maturities	$ 550.0
Senior Notes | Senior Notes Due 2027 [Member]
Stated interest rates:
Stated interest rate	4.05%
Long term debt including current maturities	$ 700.0
Senior Notes | Senior Notes Due 2023
Stated interest rates:
Stated interest rate	4.25%
Long term debt including current maturities	$ 900.0
Senior Notes | Senior Notes Due 2033
Stated interest rates:
Stated interest rate	5.45%
Long term debt including current maturities	$ 500.0
Senior Notes | Senior Notes Due 2043
Stated interest rates:
Stated interest rate	5.625%
Long term debt including current maturities	$ 600.0
Senior Notes | Senior Notes Due 2041
Stated interest rates:
Stated interest rate	4.875%
Long term debt including current maturities	$ 300.0
Senior Notes | Senior Notes Due 2021
Stated interest rates:
Stated interest rate	3.75%
Debentures | Debentures Due 2028
Stated interest rates:
Long term debt including current maturities	$ 147.1
Unsecured Notes
Stated interest rates:
Effective interest rate	5.18%
Long-term Debt, Excluding Current Maturities
Stated value of issued debt	$ 3,550.0		4,000.0
Fair value adjustment of debt	0.0		0.0
Debt Instrument, Unamortized Discount	6.6		5.3
Total long term debt	$ 3,543.4		3,994.7
Maturity year - earliest	Jan. 01, 2022
Maturity year - latest	Dec. 31, 2043
Maturities of Long-term Debt
Total long term debt	$ 3,543.4		3,994.7
Unsecured Notes | Minimum
Stated interest rates:
Stated interest rate	3.25%
Unsecured Notes | Maximum
Stated interest rates:
Stated interest rate	5.63%
Unsecured Debentures
Stated interest rates:
Effective interest rate	7.19%
Long-term Debt, Excluding Current Maturities
Stated value of issued debt	$ 147.1		147.1
Fair value adjustment of debt	0.7		0.9
Debt Instrument, Unamortized Discount	0.0		0.0
Total long term debt	$ 147.8		148.0
Maturity year - latest	Dec. 31, 2028
Maturities of Long-term Debt
Total long term debt	$ 147.8		148.0
Unsecured Debentures | Minimum
Stated interest rates:
Stated interest rate	0.00%
Unsecured Debentures | Maximum
Stated interest rates:
Stated interest rate	7.30%
Finance Leases
Stated interest rates:
Effective interest rate	2.39%
Long-term Debt, Excluding Current Maturities
Stated value of issued debt	$ 213.0		344.5
Fair value adjustment of debt	0.0		0.0
Debt Instrument, Unamortized Discount	0.0		0.0
Total long term debt	$ 213.0		344.5
Maturity year - earliest	Jan. 01, 2022
Maturity year - latest	Dec. 31, 2030
Maturities of Long-term Debt
Total long term debt	$ 213.0		344.5
Finance Leases | Minimum
Stated interest rates:
Stated interest rate	0.60%
Finance Leases | Maximum
Stated interest rates:
Stated interest rate	19.72%
Other
Stated interest rates:
Effective interest rate	4.08%
Long-term Debt, Excluding Current Maturities
Stated value of issued debt	$ 64.9	[1]	78.8
Fair value adjustment of debt	9.7		12.0
Debt Instrument, Unamortized Discount	0.0		0.0
Total long term debt	$ 74.6	[1]	90.8
Maturity year - earliest	Jan. 01, 2022
Maturity year - latest	Dec. 31, 2026
Maturities of Long-term Debt
Total long term debt	$ 74.6	[1]	$ 90.8
Other | Minimum
Stated interest rates:
Stated interest rate	6.53%
Other | Maximum
Stated interest rates:
Stated interest rate	8.00%
[1] Includes deferred financing fees related to our long term debt.

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