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Other Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Capitalized software costs, net of accumulated amortization $ 12.9 $ 11.9
Grantor trust assets 18.0 14.7
Net pension assets 9.3 5.9
Long-term supplies inventory 6.6 6.9
Operating lease assets 19.8 20.9
Other assets 2.6 8.9
Total $ 69.2 $ 69.2