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Summary of Significant Accounting Policies - Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Aug. 03, 2018 | Jul. 28, 2016 | Oct. 29, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Shares authorized to be repurchased (in shares) |  |  |  | 6,000,000.0 | 6,000,000.0 | 6,000,000.0
Shares repurchased (in shares) | 5,700,000 | 1,900,000 | 6,600,000 |  |  |
Total cost of shares repurchased | $ 500.7 | $ 203.9 | $ 482.2 |  |  |
Dividends declared (in dollars per share) | $ 2.02 | $ 1.86 | $ 1.72 |  |  |
Total dividend payments | $ 127.3 | $ 123.7 | $ 118.4 |  |  |
Net earnings, net of tax, attributable to noncontrolling interests | $ (4.9) | $ 6.5 | $ 10.1 |  |  |
August 2018 Authorization |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Shares repurchased (in shares) | 2,900,000 |  |  |  |  |
Shares remaining authorized for repurchase (in shares) | 3,100,000 |  |  |  |  |
July 2016 Authorization |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Shares repurchased (in shares) | 2,800,000 | 1,900,000 | 1,300,000 |  |  |
Shares remaining authorized for repurchase (in shares) | 0 |  |  |  |  |
2015 Authorization |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Shares repurchased (in shares) |  |  | 5,300,000 |  |  |
Shares remaining authorized for repurchase (in shares) | 0 |  |  |  |  |

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