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Changes in Shareholders' Equity Changes in Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stockholders' Equity Attributable to Parent | $ 2,045.7 |  | $ 2,045.7 |  |
Net Income |  |  | 91.4 |  |
Other Comprehensive Income (Loss) | (47.3) | $ 22.5 | (143.0) | $ 39.6 |
Total Comprehensive Income (Loss) | $ (9.7) | $ 59.1 | (51.6) | $ 75.9 |
Cash Dividends and Dividend Equivalents to Shareholders ($0.24 per share) |  |  | $ (24.9) |  |
Dividends Paid to Shareholders Per Share (in dollars per share) | $ 0.24 | $ 0.24 | $ 0.48 | $ 0.48 |
Equity-based Compensation Cost |  |  | $ 8.1 |  |
Equity-based Awards, Net of Shares Exchanged |  |  | (1.5) |  |
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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