Reinsurance (Tables)

12 Months Ended

Dec. 31, 2018

Insurance [Abstract]

Schedule of Reinsurance Premiums

Premiums were as follows:

	For the Years Ended December 31,
(in millions)	2018			2017			2016
Direct written premiums	$	2,293.8		$	2,029.2		$	1,792.5
Reinsurance ceded to other companies	(1,189.7		)	(1,043.7		)	(724.6		)
Reinsurance assumed from other companies	661.4			668.0			372.3
Net written premiums	$	1,765.5		$	1,653.5		$	1,440.2
Direct earned premiums	$	2,201.9		$	1,912.2		$	1,722.8
Reinsurance ceded to other companies	(1,137.9		)	(1,033.6		)	(675.8		)
Reinsurance assumed from other companies	667.7			693.7			363.8
Net earned premiums	$	1,731.7		$	1,572.3		$	1,410.8
Percentage of reinsurance assumed to net earned premiums	38.6		%	44.1		%	25.8		%