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Common Shares, Treasury Shares, Reserves and Dividends - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 01, 2018 | Oct. 05, 2016 | Dec. 31, 2016 | Feb. 03, 2018 | Oct. 28, 2017 | Jul. 29, 2017 | Apr. 29, 2017 | Jan. 28, 2017 | Oct. 29, 2016 | Jul. 30, 2016 | Apr. 30, 2016 | Jan. 30, 2016 | Oct. 31, 2015 | Aug. 01, 2015 | May 02, 2015 | Feb. 03, 2018 | Jan. 28, 2017 | Jan. 30, 2016 | Jun. 30, 2017 | Aug. 31, 2016 | Feb. 29, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares, par value (usd per share) |  |  |  | $ 0.18 |  |  |  | $ 0.18 |  |  |  |  |  |  |  | $ 0.18 | $ 0.18 |  |  |  |
Proceeds from issuance of common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000 | $ 2,100,000 | $ 5,000,000 |  |  |
Shares repurchased (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,100,000 | 11,200,000 | 1,000,000 |  |  |
Amount repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 460,000,000 | $ 1,000,000,000 | $ 130,000,000 |  |  |
Average repurchase price per share (usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 56.91 | $ 89.10 | $ 127.63 |  |  |
Treasury stock held (shares) |  |  |  | 26,700,000 |  |  |  | 18,900,000 |  |  |  |  |  |  |  | 26,700,000 | 18,900,000 |  |  |  |
Treasury stock reissued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 | 100,000 |  |  |  |
Dividends declared per common share (usd per share) |  |  |  | $ 0.31 | $ 0.31 | $ 0.31 | $ 0.31 | $ 0.26 | $ 0.26 | $ 0.26 | $ 0.26 | $ 0.22 | $ 0.22 | $ 0.22 | $ 0.22 | $ 1.24 | $ 1.04 | $ 0.88 |  |  |
Dividends on preferred shares |  |  |  | $ 18,800,000 |  |  |  | $ 17,700,000 |  |  |  |  |  |  |  | $ 18,800,000 | $ 17,700,000 |  |  |  |
Cumulative undeclared dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Dividends on redeemable convertible preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,900,000 | $ 11,900,000 |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared date | Mar. 14, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share (usd per share) | $ 0.37 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable date | Jun. 01, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, date of record | May 04, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount authorized |  |  |  | 1,375,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 1,375,000,000 |  |  |  | $ 625,000,000 | $ 750,000,000
Shares repurchased (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,082,630 | 10,004,333 |  |  |  |
Amount repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 460,000,000 | $ 864,400,000 |  |  |  |
Average repurchase price per share (usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 56.91 | $ 86.40 |  |  |  |
Accelerated Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchases, payment |  | $ 525,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased (shares) |  | 4,700,000 | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 |  |  |  |  |
Amount repurchased |  | $ 367,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average repurchase price per share (usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 87.01 |  |  |  |  |
2017 Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount authorized |  |  |  | $ 650,600,000 |  |  |  |  |  |  |  |  |  |  |  | $ 650,600,000 |  |  | $ 600,000,000.0 |  |
Series A Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends on redeemable convertible preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,700,000 | $ 600,000 |  |  |  |

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