Fair Value (Items Measured At Fair Value On A Recurring Basis) (Details) - Recurring - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Total
Cash equivalents:
Derivative assets (see Note T)	$ 5.9	$ 7.9
Total assets	171.3	210.3
Liabilities:
Derivative liabilities (see Note T)	1.2	2.5
Total liabilities	52.1	47.9
Total | Diversified investments associated with the Executive Stock Unit Program (ESUP)
Cash equivalents:
Diversified investments associated with the ESUP (see Note M)	51.0	45.9
Total | Liabilities associated with the ESUP
Liabilities:
Liabilities associated with the ESUP (see Note M)	50.9	45.4
Level 1
Cash equivalents:
Derivative assets (see Note T)	0.0	0.0
Total assets	51.0	45.9
Liabilities:
Derivative liabilities (see Note T)	0.0	0.0
Total liabilities	50.9	45.4
Level 1 | Diversified investments associated with the Executive Stock Unit Program (ESUP)
Cash equivalents:
Diversified investments associated with the ESUP (see Note M)	51.0	45.9
Level 1 | Liabilities associated with the ESUP
Liabilities:
Liabilities associated with the ESUP (see Note M)	50.9	45.4
Level 2
Cash equivalents:
Derivative assets (see Note T)	5.9	7.9
Total assets	120.3	164.4
Liabilities:
Derivative liabilities (see Note T)	1.2	2.5
Total liabilities	1.2	2.5
Level 2 | Diversified investments associated with the Executive Stock Unit Program (ESUP)
Cash equivalents:
Diversified investments associated with the ESUP (see Note M)	0.0	0.0
Level 2 | Liabilities associated with the ESUP
Liabilities:
Liabilities associated with the ESUP (see Note M)	0.0	0.0
Level 3
Cash equivalents:
Derivative assets (see Note T)	0.0	0.0
Total assets	0.0	0.0
Liabilities:
Derivative liabilities (see Note T)	0.0	0.0
Total liabilities	0.0	0.0
Level 3 | Diversified investments associated with the Executive Stock Unit Program (ESUP)
Cash equivalents:
Diversified investments associated with the ESUP (see Note M)	0.0	0.0
Level 3 | Liabilities associated with the ESUP
Liabilities:
Liabilities associated with the ESUP (see Note M)	0.0	0.0
Bank time deposits with original maturities of three months or less | Total
Cash equivalents:
Bank time deposits with original maturities of three months or less	114.4	156.5
Bank time deposits with original maturities of three months or less | Level 1
Cash equivalents:
Bank time deposits with original maturities of three months or less	0.0	0.0
Bank time deposits with original maturities of three months or less | Level 2
Cash equivalents:
Bank time deposits with original maturities of three months or less	114.4	156.5
Bank time deposits with original maturities of three months or less | Level 3
Cash equivalents:
Bank time deposits with original maturities of three months or less	$ 0.0	$ 0.0