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Capital Stock (Common Shares Reserved for Future Issuance) (Details) - shares shares in Millions | Sep. 30, 2018 | Apr. 15, 2018 | Mar. 31, 2018
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Common Shares Reserved For Future Issuance [Line Items] |  |  |
Shares reserved for future issuance (in shares) | 44.2 |  | 46.7
Stock Options and Equity-Settled SARs |  |  |
Common Shares Reserved For Future Issuance [Line Items] |  |  |
Shares reserved for future issuance (in shares) | 33.8 |  | 32.1
Restricted Stock and Restricted Share Units - Unvested |  |  |
Common Shares Reserved For Future Issuance [Line Items] |  |  |
Shares reserved for future issuance (in shares) | 2.3 |  | 2.2
Common shares available for future issuance under the 2017 Plan |  |  |
Common Shares Reserved For Future Issuance [Line Items] |  |  |
Shares reserved for future issuance (in shares) | 8.1 |  | 10.3
Convertible Senior Subordinated Notes | April 2013 Notes |  |  |
Common Shares Reserved For Future Issuance [Line Items] |  |  |
Shares reserved for future issuance (in shares) | 0.0 |  | 2.1
April 2013 Notes | Convertible Senior Subordinated Notes |  |  |
Common Shares Reserved For Future Issuance [Line Items] |  |  |
Coupon rate | 1.25% | 1.25% |

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