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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) yr | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2019 USD ($)
Mortgage Banking [Abstract] |  |  |  |
Mortgage servicing rights | $ 193.8 | $ 186.7 |  |
Mortgage-backed Securities Held-to-maturity, Fair Value Disclosure | $ 246.8 | 220.1 |  |
Real Estate Investments, Net [Abstract] |  |  |  |
Minimum ownership percentage in real estate ventures (in hundredths) | 1.00% |  |  |
Maximum ownership percentage in real estate ventures (in hundredths) | 10.00% |  |  |
Foreign Currency Translation [Abstract] |  |  |  |
Net foreign currency gains (losses) | $ (4.1) | (4.8) | $ 6.2 |
Bank Servicing Fees. | $ 49.6 | $ 43.3 | $ 37.0 |
Stock Compensation Plan [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Sum Of Age Plus Years Of Service Minimum | yr | 65 |  |  |
Minimum [Member] |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  | $ 650.0
Maximum [Member] |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  | $ 700.0

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- Definition Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as held-to-maturity. + References No definition available. + Details
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