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Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Carrying Value Reported Amount Fair Value Disclosure    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 316.7 $ 687.7
Derivative financial instruments, Assets 41.5 7.6
Derivative Financial Instruments, liabilities 17.1 2.7
Debt 1,844.0 1,863.7
Estimate Of Fair Value Fair Value Disclosure    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 316.7 687.7
Derivative financial instruments, Assets 41.5 7.6
Derivative Financial Instruments, liabilities 17.1 2.7
Debt 2,148.3 2,003.2
Estimate Of Fair Value Fair Value Disclosure | Fair Value Inputs Level 1    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 316.7 687.7
Derivative financial instruments, Assets 0.0 0.0
Derivative Financial Instruments, liabilities 0.0 0.0
Debt 1,854.9 1,690.1
Estimate Of Fair Value Fair Value Disclosure | Fair Value Inputs Level 2    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 0.0 0.0
Derivative financial instruments, Assets 41.5 7.6
Derivative Financial Instruments, liabilities 17.1 2.7
Debt 293.4 $ 313.1
Convertible Debt | Allegheny Technologies 3.5% Convertible Senior Notes due 2025 | Estimate Of Fair Value Fair Value Disclosure | Fair Value Inputs Level 1    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Debt $ 550.0