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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Schedule Of Stock Repurchase Activities The following table provides the stock repurchase activities (in millions, except per share amounts):
 Years Ended December 31,
 202120202019
Shares repurchased— 0.7 1.7 
Average price per share$— $183.84 $160.45 
Value of shares repurchased$— $134.3 $269.5 
Components of Accumulated Other Comprehensive Income (Loss), Net of Tax
The components of accumulated other comprehensive income (loss), net of tax, are as follows (in millions):
 Year Ended December 31, 2021
 Unrealized Gains (Losses)
on Hedging
Instruments		Unrealized 
Gains (Losses)
on
Available-for-Sale Securities		Foreign
Currency
Translation
Gains
(Losses)		Employee Benefit PlansTotal
Beginning balance$(2.9)$29.5 $4.7 $(6.4)$24.9 
Other comprehensive income (loss) before reclassifications
12.3 (45.5)(12.6)0.1 (45.7)
Reclassified from accumulated other comprehensive income (loss)
(4.9)— — 1.5 (3.4)
Net current-period other comprehensive income (loss)7.4 (45.5)(12.6)1.6 (49.1)
Ending balance$4.5 $(16.0)$(7.9)$(4.8)$(24.2)
 Year Ended December 31, 2020
 Unrealized Gains (Losses)
on Hedging
Instruments		Unrealized
Gains (Losses)
on
Available-for-Sale Securities		Foreign
Currency
Translation
Gains
(Losses)		Employee Benefit PlansTotal
Beginning balance$0.7 $20.4 $— $(8.7)$12.4 
Other comprehensive income (loss) before reclassifications
(0.8)13.8 4.7 1.0 18.7 
Reclassified from accumulated other comprehensive income (loss)
(2.8)(4.7)— 1.3 (6.2)
Net current-period other comprehensive income (loss)(3.6)9.1 4.7 2.3 12.5 
Ending balance$(2.9)$29.5 $4.7 $(6.4)$24.9 
The income tax impacts were not material for the years ended December 31, 2021, and 2020.