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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings per Share
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
(in millions, except per share data)
2019
 
2018
 
2019
 
2018
Net income attributable to common shareholders
$
72.5

 
$
97.0

 
$
245.9

 
$
246.4

 
 
 
 
 
 
 
 
Average basic shares outstanding
60.0

 
59.7

 
59.9

 
59.7

Effect of dilutive stock options
0.8

 
1.4

 
0.9

 
1.4

Average diluted shares outstanding
60.8

 
61.1

 
60.8

 
61.1

 
 
 
 
 
 
 
 
Earnings per basic share
$
1.21

 
$
1.62

 
$
4.11

 
$
4.13

Earnings per diluted share
$
1.19

 
$
1.59

 
$
4.05

 
$
4.04