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Net Income Per Common Share (Tables)
 6 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Schedule of earnings per share, basic and diluted
The following table sets forth the computation of basic and diluted net income per common share (in millions, except per share amounts):
 
Three Months Ended
 
Six Months Ended
 
September 30,
 
September 30,
 
2018
 
2017
 
2018
 
2017
Net income
$
96.3

 
$
189.2

 
$
132.0

 
$
359.7

Weighted average common shares outstanding
235.8

 
233.3

 
235.5

 
231.4

Dilutive effect of stock options and RSUs
4.3

 
4.5

 
4.2

 
4.4

Dilutive effect of 2007 Junior Convertible Debt
—

 
0.7

 
—

 
2.4

Dilutive effect of 2015 Senior Convertible Debt
11.7

 
6.3

 
12.3

 
5.6

Dilutive effect of 2017 Senior Convertible Debt
—

 
—

 
—

 
—

Dilutive effect of 2017 Junior Convertible Debt
—

 
—

 
—

 
—

Weighted average common and potential common shares outstanding
251.8

 
244.8

 
252.0

 
243.8

Basic net income per common share
$
0.41

 
$
0.81

 
$
0.56

 
$
1.55

Diluted net income per common share
$
0.38

 
$
0.77

 
$
0.52

 
$
1.48
Schedule of convertible debt
The following table sets forth the applicable Conversion Rates adjusted for dividends declared since issuance of such series of Convertible Debt and the applicable Incremental Share Factors and Maximum Conversion Rates as adjusted for dividends paid since the applicable issuance date:
 
Dividend adjusted rates as of September 30, 2018
 
Conversion Rate, adjusted
 
Approximate Conversion Price, adjusted
 
Incremental Share Factor, adjusted
 
Maximum Conversion Rate, adjusted
2017 Senior Convertible Debt
10.2005

 
$
98.03

 
5.1002

 
14.5357

2015 Senior Convertible Debt
15.9069

 
$
62.87

 
7.9535

 
22.2697

2017 Junior Convertible Debt
10.3827

 
$
96.31

 
5.1914

 
14.5357

he following is the weighted average conversion price per share used in calculating the dilutive effect (See Note 13 for details on the convertible debt):
 
Three Months Ended
 
Six Months Ended
 
September 30,
 
September 30,
 
2018
 
2017
 
2018
 
2017
2007 Junior Convertible Debt (1)
$
—

 
$
23.58

 
$
—

 
$
23.64

2015 Senior Convertible Debt
$
63.02

 
$
64.06

 
$
63.14

 
$
64.21

2017 Senior Convertible Debt
$
98.27

 
$
99.90

 
$
98.47

 
$
100.13

2017 Junior Convertible Debt
$
96.55

 
$
98.15

 
$
96.74

 
$
98.37

(1) No longer outstanding as of December 31, 2017.