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Acquisitions (Summary of Acquisitions) (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Business Acquisition [Line Items] |  |
Cash paid, net of cash acquired | $ 75.0 | $ 374.6
2019 Acquisitions |  |
Business Acquisition [Line Items] |  |
Cash paid, net of cash acquired | 75.0 |
Debt issued | 26.4 |
Total consideration | $ 101.4 |

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