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Net Income Per Share (Tables)
 6 Months Ended
Jun. 30, 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 June 30,20212020
(in millions, except per share amounts)Class AClass BClass AClass B
Net income applicable to common stockholders - basic$304.9 $— $76.3 $1.4 
Reallocation of net income due to conversion of Class B to Class A common shares outstanding— — 0.1 — 
Conversion of Class B common shares into Class A common shares— — 1.3 — 
Net income applicable to common stockholders - diluted$304.9 $— $77.7 $1.4 
Weighted average common shares outstanding – basic28.1 — 22.4 0.4 
Conversion of Class B common shares into Class A common shares— — 0.4 — 
Effect of dilutive stock options on weighted average common shares0.3 — 0.2 — 
Weighted average common shares outstanding – diluted28.4 — 23.0 0.4 
Net income per common share - basic$10.83 $— $3.40 $3.40 
Net income per common share - diluted$10.75 $— $3.38 $3.38 
Six Months Ended June 30,20212020
(in millions, except per share amounts)Class AClass BClass AClass B
Net income applicable to common stockholders - basic$460.5 $0.6 $121.8 $2.1 
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 shares0.6 — 1.9 — 
Net income applicable to common stockholders - diluted$461.1 $0.6 $123.9 $2.1 
Weighted average common shares outstanding – basic27.4 — 22.7 0.4 
Conversion of class B common shares into class A common shares— — 0.4 — 
Effect of employee stock purchases and restricted stock units on weighted average common shares0.2 — 0.2 — 
Weighted average common shares outstanding – diluted 27.6 — 23.3 0.4 
Net income per common share - basic$16.83 $16.83 $5.37 $5.37 
Net income per common share - diluted$16.69 $16.69 $5.32 $5.32