Goodwill and Other Intangible Assets (Schedule of Expected Future Amortization Expense) (Details) $ in Millions	Dec. 31, 2020 USD ($)
Amortization Expense
Intangible assets, expected future amortization expense, 2021	$ 31.7
Intangible assets, expected future amortization expense, 2022	25.4
Intangible assets, expected future amortization expense, 2023	19.7
Intangible assets, expected future amortization expense, 2024	15.3
Intangible assets, expected future amortization expense, 2025	11.7
Intangible assets, expected future amortization expense, thereafter	45.7
Intangible assets, expected future amortization expense, total	$ 149.5