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Shareholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 10, 2019 | Nov. 09, 2018 | May 04, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Oct. 31, 2019 | Aug. 31, 2018 | Jul. 31, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Interest and other expenses (income), net |  |  |  | $ 12.2 | $ 11.8 | $ (46.1) | $ 38.4 |  |  |
Dividends declared (in dollars per share) | $ 1.09 | $ 1.01 | $ 1.01 |  |  |  |  |  |  |
Dividends paid date | Jun. 14, 2019 | Dec. 14, 2018 | Jun. 15, 2018 |  |  |  |  |  |  |
Dividends record date | Jun. 03, 2019 | Dec. 03, 2018 | Jun. 01, 2018 |  |  |  |  |  |  |
Total cost of shares repurchased |  |  |  |  |  | $ 152.0 | $ 299.2 |  |  |
Common Stock Repurchase 2019 Authorization |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized to be repurchased (in shares) |  |  |  |  |  |  |  | 6,000,000.0 |  |
Shares remaining authorized for repurchase (in shares) |  |  |  | 6,000,000.0 |  | 6,000,000.0 |  |  |  |
Common Stock Repurchase 2018 Authorization |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized to be repurchased (in shares) |  |  |  |  | 300,000 |  | 300,000 |  | 6,000,000.0 |
Shares repurchased during period (in shares) |  |  |  |  |  | 1,800,000 |  |  |  |
Shares remaining authorized for repurchase (in shares) |  |  |  | 1,300,000 |  | 1,300,000 |  |  |  |
2016 Authorization |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized to be repurchased (in shares) |  |  |  |  | 2,800,000 |  | 2,800,000 |  |  | 6,000,000.0
Shares repurchased during period (in shares) |  |  |  |  |  |  | 3,100,000 |  |  |
Shares remaining authorized for repurchase (in shares) |  |  |  | 0 |  | 0 |  |  |  |
Non-Controlling Interests |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Interest and other expenses (income), net |  |  |  | $ 0.2 | $ 1.3 | $ 1.3 | $ 3.5 |  |  |

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