Goodwill and Other Intangibles (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]
Other Intangibles Amortization	$ 4.3	$ 4.1
Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Other Intangibles Amortization	4.3	4.1
Estimated future amortization expense for 2021	10.5
Estimated future amortization expense for 2022	10.1
Estimated future amortization expense for 2023	9.8
Estimated future amortization expense for 2024	9.7
Estimated future amortization expense for 2025	9.1
Computer Software
Acquired Finite-Lived Intangible Assets [Line Items]
Other Intangibles Amortization	$ 94.0	$ 91.6