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Net Income Per Common Share From Continuing Operations (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations | $ 174.7 | $ 49.2 | $ 96.3 | $ 35.7 | $ 146.7 | $ (251.1) | $ 189.2 | $ 170.6 | $ 355.9 | $ 255.4 | $ 170.6
Weighted average common shares outstanding (in shares) |  |  |  |  |  |  |  |  | 236,200,000 | 232,900,000 | 217,200,000
Dilutive effect of stock options and RSUs (in shares) |  |  |  |  |  |  |  |  | 3,800,000 | 4,400,000 | 4,400,000
Diluted weighted average common shares outstanding |  |  |  |  |  |  |  |  | 249,900,000 | 248,900,000 | 234,800,000
Antidilutive option shares |  |  |  |  |  |  |  |  | 0 | 0 | 0
Basic net income per common share from continuing operations (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.51 | $ 1.10 | $ 0.79
Diluted net income per common share from continuing operations (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.42 | $ 1.03 | $ 0.73
2007 Junior Convertible Notes |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dilutive effect of subordinated convertible debentures (in shares) |  |  |  |  |  |  |  |  | 0 | 1,300,000 | 12,700,000
Shares issued to settle convertible debt (in shares) |  |  |  |  |  |  |  |  |  | 3,700,000 | 12,000,000.0
Extinguishment of debt, amount |  |  |  |  |  |  |  |  |  | $ 143.8 | $ 431.3
2015 Senior Convertible Debt |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dilutive effect of subordinated convertible debentures (in shares) |  |  |  |  |  |  |  |  | 9,900,000 | 10,300,000 | 500,000
Weighted average conversion price per share used in calculating dilutive effect of convertible debt amount per share (in usd per share) | $ 62.30 |  |  |  |  |  |  |  | $ 62.30 |  |
2017 Senior Convertible Debt |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dilutive effect of subordinated convertible debentures (in shares) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Weighted average conversion price per share used in calculating dilutive effect of convertible debt amount per share (in usd per share) | 97.16 |  |  |  |  |  |  |  | $ 97.16 |  |
2017 Junior Convertible Debt |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dilutive effect of subordinated convertible debentures (in shares) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Weighted average conversion price per share used in calculating dilutive effect of convertible debt amount per share (in usd per share) | 95.45 |  |  |  |  |  |  |  | $ 95.45 |  |
Weighted Average | 2007 Junior Convertible Notes |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average conversion price per share used in calculating dilutive effect of convertible debt amount per share (in usd per share) |  |  |  |  | $ 23.59 |  |  |  |  | $ 23.59 | $ 24.01
Weighted Average | 2015 Senior Convertible Debt |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average conversion price per share used in calculating dilutive effect of convertible debt amount per share (in usd per share) | 62.86 |  |  |  | 63.94 |  |  |  | 62.86 | 63.94 | 65.21
Weighted Average | 2017 Senior Convertible Debt |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average conversion price per share used in calculating dilutive effect of convertible debt amount per share (in usd per share) | 98.03 |  |  |  | 99.71 |  |  |  | 98.03 | 99.71 | 100.58
Weighted Average | 2017 Junior Convertible Debt |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average conversion price per share used in calculating dilutive effect of convertible debt amount per share (in usd per share) | $ 96.31 |  |  |  | $ 97.96 |  |  |  | $ 96.31 | $ 97.96 | $ 98.81

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