Goodwill and Other Intangibles (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense related to other intangible assets	$ 4.2	$ 4.5
Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense related to other intangible assets	4.2	$ 4.5
Estimated future amortization expense for 2019	12.5
Estimated future amortization expense for 2020	16.6
Estimated future amortization expense for 2021	14.2
Estimated future amortization expense for 2022	9.6
Estimated future amortization expense for 2023	9.4
BEx LLC
Acquired Finite-Lived Intangible Assets [Line Items]
Consideration transferred	37.9
Goodwill acquired	12.5
Software intangible assets acquired	$ 25.0