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Reinsurance (Tables)
 12 Months Ended
Dec. 31, 2018
Reinsurance Disclosures [Abstract]  
Effect of Reinsurance on Premiums Written and Earned
The effect of reinsurance on premiums written and earned for the years ended December 31, was as follows:
  
2018
 
2017
 
2016
(millions)
Written

Earned

 
Written

Earned

 
Written

Earned

Direct premiums
$
33,753.1

$
31,970.2

 
$
27,860.7

$
26,425.7

 
$
23,941.9

$
23,111.2

Ceded premiums:
 
 
 
 
 
 
 
 
Regulated plans
(596.4
)
(557.5
)
 
(505.9
)
(479.6
)
 
(439.4
)
(425.1
)
Non-Regulated plans
(546.8
)
(479.4
)
 
(222.7
)
(216.2
)
 
(149.0
)
(212.1
)
Total ceded premiums
(1,143.2
)
(1,036.9
)
 
(728.6
)
(695.8
)
 
(588.4
)
(637.2
)
Net premiums
$
32,609.9

$
30,933.3

 
$
27,132.1

$
25,729.9

 
$
23,353.5

$
22,474.0
Prepaid Reinsurance Premiums and Reinsurance Recoverables
Our prepaid reinsurance premiums and reinsurance recoverables were comprised of the following at December 31:
 
Prepaid Reinsurance Premiums
 
Reinsurance Recoverables
($ in millions)
2018
 
2017
 
2018
 
2017
Regulated plans:
 
 
 
 
 
 
 
 
 
 
 
MCCA
$
55.3

18
%
 
$
44.3

22
%
 
$
1,903.9

71
%
 
$
1,611.5

71
%
CAIP
72.9

24

 
50.0

25

 
254.7

9

 
218.0

10

NCRF
34.0

11

 
31.5

15

 
78.1

3

 
74.2

3

NFIP
55.9

18

 
53.8

26

 
27.8

1

 
148.8

7

Other
0.6

0

 
0.3

0

 
21.4

1

 
8.2

0

Total Regulated plans
218.7

71

 
179.9

88

 
2,285.9

85

 
2,060.7

91

Non-Regulated plans:
 
 
 
 
 
 
 
 
 
 
 
Commercial Lines
79.2

25

 
14.3

7

 
254.2

10

 
63.4

3

Property
11.8

4

 
9.1

5

 
147.7

5

 
138.6

6

Other
0

0

 
0

0

 
8.3

0

 
10.7

0

Total Non-Regulated plans
91.0

29

 
23.4

12

 
410.2

15

 
212.7

9

Total
$
309.7

100
%
 
$
203.3

100
%
 
$
2,696.1

100
%
 
$
2,273.4

100
%