Goodwill and Intangible Assets Goodwill and intangible (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets Acquired	$ 166.4	$ 11.3
Definite Lived Intangible Assets:	261.0	133.2
Total Indefinite Lived Intangible Assets	47.8	39.8
Total Intangible Assets	308.8	173.0
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Definite Lived Intangible Assets:	6.7	7.3
Agent Relationships
Finite-Lived Intangible Assets [Line Items]
Definite Lived Intangible Assets:	68.0	15.6
Trade Names
Finite-Lived Intangible Assets [Line Items]
Definite Lived Intangible Assets:	7.0	1.4
Internal-Use Software
Finite-Lived Intangible Assets [Line Items]
Definite Lived Intangible Assets:	149.1	82.9
Insurance Licenses
Finite-Lived Intangible Assets [Line Items]
Total Indefinite Lived Intangible Assets	42.6	34.6
Trade Names
Finite-Lived Intangible Assets [Line Items]
Total Indefinite Lived Intangible Assets	$ 5.2	$ 5.2