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Shareholders' Equity (Shares Repurchased Under Share Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Aggregate purchase price |  | $ 11.2 | $ 33.5 |  | $ 73.4 | $ 26.6 |  |
Stock Repurchase Program Board Authorized Repurchases [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares repurchased (in shares) | 0.0 |  |  | 0.0 |  |  | 1.3 | 2.1
Aggregate purchase price | $ 0.0 |  |  | $ 0.0 |  |  | $ 44.7 | $ 100.0
Average purchase price per share (in dollars per share) | $ 0 |  |  | $ 0 |  |  | $ 35.51 | $ 47.58
Remaining amount available for share repurchase | $ 219.0 |  |  |  |  |  | $ 219.0 |

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