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Changes in Shareholders' Equity Changes in Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stockholders' Equity Attributable to Parent | $ 3,063.8 |  | $ 3,063.8 |  |
Net Income |  |  | 183.6 |  |
Other Comprehensive Income (Loss) | (38.6) | $ 9.8 | (181.6) | $ 49.4 |
Total Comprehensive Income | $ 53.6 | $ 57.5 | 2.0 | $ 133.4 |
Cash Dividends and Dividend Equivalents to Shareholders ($0.24 per share) |  |  | (40.7) |  |
Common Stock Issued |  |  | $ 978.5 |  |
Dividends Paid to Shareholders Per Share (in dollars per share) | $ 0.24 | $ 0.24 | $ 0.72 | $ 0.72 |
Equity-based Compensation Cost |  |  | $ 13.5 |  |
Equity-based Awards, Net of Shares Exchanged |  |  | (5.1) |  |
Stockholders' Equity Attributable to Parent |  |  | $ 2,115.6 |  |
AOCI Attributable to Parent [Member] | Accounting Standards Update 2016-01 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | $ (17.7)
AOCI Attributable to Parent [Member] | Accounting Standards Update 2018-02 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | 35.9
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | 17.7
Retained Earnings [Member] | Accounting Standards Update 2018-02 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | $ (35.9)

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