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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2020
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)
2020
 
2019
 
2020
 
2019
Net income attributable to common shareholders
$
56.6

 
$
72.5

 
$
134.2

 
$
245.9

 
 
 
 
 
 
 
 
Average basic shares outstanding
58.1

 
60.0

 
58.4

 
59.9

Effect of dilutive share-based awards
0.4

 
0.8

 
0.5

 
0.9

Average diluted shares outstanding
58.5

 
60.8

 
58.9

 
60.8

 
 
 
 
 
 
 
 
Earnings per basic share
$
0.97

 
$
1.21

 
$
2.30

 
$
4.11

Earnings per diluted share
$
0.97

 
$
1.19

 
$
2.28

 
$
4.05