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Operations and Summary of Significant Accounting Policies (Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive gain (loss), net of reclassification adjustments $ 39.5 $ (219.9) $ (37.3)
AOCI Attributable To Parent      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss), before tax amount 67.5 (218.3) (39.6)
Other comprehensive income (loss), income taxes (27.6) 2.7 (0.2)
Other comprehensive gain (loss), net of reclassification adjustments 39.9 (215.6) (39.8)
Defined Benefit Pension Plans      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss), before tax amount 110.1 (19.3) (13.4)
Other comprehensive income (loss), income taxes (27.2) 2.4 (0.6)
Other comprehensive gain (loss), net of reclassification adjustments 82.9 (16.9) (14.0)
Net gain on derivatives      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss), before tax amount 2.5 (1.5) (3.1)
Other comprehensive income (loss), income taxes (0.4) 0.3 0.4
Other comprehensive gain (loss), net of reclassification adjustments 2.1 (1.2) (2.7)
Foreign currency translation adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss), before tax amount (45.1) (197.5) (23.1)
Other comprehensive income (loss), income taxes 0.0 0.0 0.0
Other comprehensive gain (loss), net of reclassification adjustments (45.1) (197.5) (23.1)
AOCI Attributable to Noncontrolling Interest      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive gain (loss), net of reclassification adjustments (0.4) (4.3) 2.5
Defined benefit pension plans      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive gain (loss), net of reclassification adjustments 0.0 0.0 0.0
Net loss on derivatives      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive gain (loss), net of reclassification adjustments 0.0 0.0 0.0
Foreign currency translation adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive gain (loss), net of reclassification adjustments $ (0.4) $ (4.3) $ 2.5