| Leases Leases Assets and Lease Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | 
|---|---|---|---|
| Leases [Abstract] | |||
| Operating lease assets | $ 83.2 | $ 80.1 | $ 0.0 | 
| Current Operating Lease Liabilities | 18.4 | 0.0 | |
| Non-Current Operating Lease Liabilities | 70.1 | $ 67.1 | $ 0.0 | 
| Total Lease Liabilities | $ 88.5 | 
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- References No definition available. 
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Amount of lessee's right to use underlying asset under operating lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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