Goodwill and Other Intangible Assets (Schedule of Expected Future Amortization Expense) (Details) $ in Millions	Dec. 31, 2019 USD ($)
Amortization Expense
Intangible assets, expected future amortization expense, 2020	$ 24.5
Intangible assets, expected future amortization expense, 2021	18.9
Intangible assets, expected future amortization expense, 2022	15.5
Intangible assets, expected future amortization expense, 2023	11.6
Intangible assets, expected future amortization expense, 2024	8.5
Intangible assets, expected future amortization expense, thereafter	25.1
Intangible assets, expected future amortization expense, total	$ 104.1