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Net Income Per Share of Class A and Class B Common Stock (Tables)
 3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted The following is a reconciliation of net income and weighted average shares used for our basic earnings per share (EPS) and diluted EPS:
Three Months Ended March 31,20212020
(in millions, except per share amounts)Class AClass BClass AClass B
Net income applicable to common stockholders - basic$155.8 $0.4 $45.0 $1.2 
Reallocation of net income due to conversion of class B to class A common shares outstanding— — 0.2 — 
Conversion of class B common shares into class A common shares0.4 — 1.0 — 
Net income applicable to common stockholders - diluted$156.2 $0.4 $46.2 $1.2 
Weighted average common shares outstanding – basic26.6 0.1 22.7 0.6 
Conversion of class B common shares into class A common shares0.1 — 0.6 — 
Effect of employee stock purchases and restricted stock units on weighted average common shares0.2 — 0.2 — 
Weighted average common shares outstanding – diluted 26.9 0.1 23.5 0.6 
Net income per common share - basic$5.86 $5.86 $1.99 $1.99 
Net income per common share - diluted$5.81 $5.81 $1.97 $1.97