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Summary of Significant Accounting Policies - Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Oct. 31, 2015 | Dec. 31, 2012
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Shares authorized to be repurchased (in shares) |  |  |  |  | 6,000,000.0 | 8,000,000.0
Shares repurchased (in shares) |  | 6,700,000 | 2,000,000 | 0 |  |
Total cost of shares repurchased |  | $ 587.9 |  |  |  |
Dividends declared (in dollars per share) |  | $ 1.60 | $ 0.98 | $ 0.92 |  |
Total dividend payments |  | $ 121.0 | $ 77.3 | $ 72.0 |  |
Net earnings, net of tax, attributable to noncontrolling interests |  | $ 6.6 |  |  |  |
Subsequent event |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Total cost of shares repurchased | $ 7.7 |  |  |  |  |
2012 Authorization |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Shares repurchased (in shares) |  | 6,000,000 |  |  |  |
Shares remaining authorized for repurchase |  |  | 0 |  |  |
Total cost of shares repurchased |  |  | $ 143.5 |  |  |
2015 Authorization |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Shares repurchased (in shares) |  | 700,000 |  |  |  |
Shares remaining authorized for repurchase |  | 5,300,000 |  |  |  |

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