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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Schedule of financial instrument fair value
The estimated fair value of financial instruments at December 31, 2021 was as follows:
  Fair Value Measurements at Reporting Date Using
(In millions)Total
Carrying
Amount		Total
Estimated
Fair Value		Quoted Prices in
Active Markets for
Identical Assets
(Level 1)		Significant
Observable
Inputs
(Level 2)
Cash and cash equivalents$687.7 $687.7 $687.7 $— 
Derivative financial instruments:
Assets7.6 7.6 — 7.6 
Liabilities2.7 2.7 — 2.7 
Debt (a)1,863.7 2,003.2 1,690.1 313.1 
The estimated fair value of financial instruments at December 31, 2020 was as follows:
  Fair Value Measurements at Reporting Date Using
(In millions)Total
Carrying
Amount		Total
Estimated
Fair Value		Quoted Prices in
Active Markets for
Identical Assets
(Level 1)		Significant
Observable
Inputs
(Level 2)
Cash and cash equivalents$645.9 $645.9 $645.9 $— 
Derivative financial instruments:
Assets4.8 4.8 — 4.8 
Liabilities4.0 4.0 — 4.0 
Debt (a)1,629.1 1,847.7 1,594.2 253.5 
(a)The total carrying amount for debt excludes debt issuance costs related to the recognized debt liability which is presented in the consolidated balance sheet as a direct reduction from the carrying amount of the debt liability. The December 31, 2020 debt carrying value includes $46.8 million for the unamortized balance of the portion of the 2025 Convertible Notes recorded in stockholders’ equity due to the flexible settlement feature of the notes (see Note 10).