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Shareholders Equity (Tables)
 3 Months Ended
Mar. 31, 2024
Statement of Stockholders' Equity [Abstract]  
Schedule Of Activity In Our Various Shareholders Equity [Table Text Block]
Activity in our various shareholders' equity accounts for the three months ended March 31, 2024 and 2023 were as follows (in millions):

 Shares 
Issued		Par ValueAdditional
Paid-in
Capital		WarrantsRetained EarningsAOCI Treasury
Shares		Non-controlling
Interest
BALANCE, December 31, 202375.4 $0.8 $1,119.8 $16.4 $1,025.5 $25.2 $(200.1)$9.4 
Net income— — — — 25.5 — — — 
Share-based compensation cost— — 8.0 — — — — — 
Net changes in pension and other postretirement benefits— — — — — (0.2)— — 
Shares withheld for taxes on vesting of share-based awards
— — (0.1)— — — — — 
Net other comprehensive income— — — — — 0.1 — — 
BALANCE, March 31, 202475.4 $0.8 $1,127.7 $16.4 $1,051.0 $25.1 $(200.1)$9.4 

 Shares 
Issued		Par ValueAdditional
Paid-in
Capital		WarrantsRetained EarningsAOCI Treasury
Shares		Non-controlling
Interest
BALANCE, December 31, 2022
75.2 $0.8 $1,097.9 $16.4 $160.1 $14.7 $— $8.0 
Net income— — — — 46.7 — — 1.9 
Share-based compensation cost— — 5.7 — — — — — 
Net changes in pension and other postretirement benefits
— — — — — (0.1)— — 
Net other comprehensive loss— — — — — (0.1)— — 
BALANCE, March 31, 2023
75.2 $0.8 $1,103.6 $16.4 $206.8 $14.5 $— $9.9