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Restricted Securities Available For Sale (Tables)
 6 Months Ended
Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Schedule of Restricted Securities Available for Sale
Restricted securities available for sale consist of the following:
(In millions)
As of June 30, 2018
 
Amortized Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Estimated Fair
Value
Corporate bonds
$
22.9

 
$
—

 
$
(0.4
)
 
$
22.5

U.S. Government and agency securities
20.9

 
—

 
(0.3
)
 
20.6

Asset-backed securities
9.4

 
—

 
(0.1
)
 
9.3

Mortgage-backed securities
1.5

 
—

 
—

 
1.5

Commercial paper
0.5

 
—

 
—

 
0.5

Total restricted securities available for sale
$
55.2

 
$
—

 
$
(0.8
)
 
$
54.4

 
 
 
 
 
 
 
 
(In millions)
As of December 31, 2017
 
Amortized Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Estimated Fair
Value
Corporate bonds
$
18.2

 
$
—

 
$
(0.1
)
 
$
18.1

U.S. Government and agency securities
19.2

 
—

 
(0.2
)
 
19.0

Asset-backed securities
6.6

 
—

 
—

 
6.6

Mortgage-backed securities
2.4

 
—

 
—

 
2.4

Total restricted securities available for sale
$
46.4

 
$
—

 
$
(0.3
)
 
$
46.1
Schedule of Restricted Securities Available for Sale by Aging Category
The fair value and gross unrealized losses for restricted securities available for sale, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, are as follows:
(In millions)
Securities Available for Sale with Gross Unrealized Losses as of June 30, 2018
 
Less than 12 Months
 
12 Months or More
 
 
 
 
 
Estimated
Fair Value
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
 
Gross
Unrealized
Losses
 
Total
Estimated
Fair Value
 
Total
Gross
Unrealized
Losses
Corporate bonds
$
18.4

 
$
(0.3
)
 
$
1.1

 
$
(0.1
)
 
$
19.5

 
$
(0.4
)
U.S. Government and agency securities
14.9

 
(0.2
)
 
4.4

 
(0.1
)
 
19.3

 
(0.3
)
Asset-backed securities
6.4

 
(0.1
)
 
1.0

 
—

 
7.4

 
(0.1
)
Mortgage-backed securities
0.9

 
—

 
0.6

 
—

 
1.5

 
—

Commercial paper
0.5

 
—

 
—

 
—

 
0.5

 
—

Total restricted securities available for sale
$
41.1

 
$
(0.6
)
 
$
7.1

 
$
(0.2
)
 
$
48.2

 
$
(0.8
)

(In millions)
Securities Available for Sale with Gross Unrealized Losses as of December 31, 2017
 
Less than 12 Months
 
12 Months or More
 
 
 
 
 
Estimated
Fair Value
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
 
Gross
Unrealized
Losses
 
Total
Estimated
Fair Value
 
Total
Gross
Unrealized
Losses
Corporate bonds
$
11.1

 
$
(0.1
)
 
$
1.9

 
$
—

 
$
13.0

 
$
(0.1
)
U.S. Government and agency securities
11.0

 
(0.1
)
 
7.9

 
(0.1
)
 
18.9

 
(0.2
)
Asset-backed securities
4.9

 
—

 
1.0

 
—

 
5.9

 
—

Mortgage-backed securities
1.2

 
—

 
1.2

 
—

 
2.4

 
—

Total restricted securities available for sale
$
28.2

 
$
(0.2
)
 
$
12.0

 
$
(0.1
)
 
$
40.2

 
$
(0.3
)
Schedule of Cost and Estimated Fair Values of Debt Securities by Contractual Maturity
The cost and estimated fair values of debt securities by contractual maturity were as follows (securities with multiple maturity dates are classified in the period of final maturity). Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
(In millions)
 
As of
 
 
June 30, 2018
 
December 31, 2017
Contractual Maturity
 
Amortized Cost
 
Estimated Fair
Value
 
Amortized Cost
 
Estimated Fair
Value
Within one year
 
$
2.1

 
$
2.1

 
$
2.5

 
$
2.5

Over one year to five years
 
51.2

 
50.5

 
40.5

 
40.2

Over five years to ten years
 
0.3

 
0.3

 
1.0

 
1.0

Over ten years
 
1.6

 
1.5

 
2.4

 
2.4

Total restricted securities available for sale
 
$
55.2

 
$
54.4

 
$
46.4

 
$
46.1