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Debt (Tables)
 12 Months Ended
Dec. 31, 2016
Debt Disclosure [Abstract]  
Summary of Debt
At December 31, 2016 and 2015, our long-term debt and interest rates on that debt were as follows (dollars in millions):
 
December 31, 2016
 
December 31, 2015
 
Amount
 
Interest Rate
 
Amount
 
Interest Rate
Revolving Credit Facility, due August 2021
$
—

 
—
%
 
$
—

 
—
%
Five-Year Term Loan, due October 2018
—

 
—

 
25.0

 
1.80

Five-Year Term Loan, due August 2021
380.2

 
2.02

 
—

 
—

Seven-Year Term Loan, due October 2020
630.5

 
2.40

 
637.0

 
2.05

6.50% Senior Notes due March 2018
150.0

 
6.50

 
150.0

 
6.50

3.90% Senior Notes, net of discounts of $0.2 million and $0.3 million as of December 31, 2016 and 2015, respectively, due June 2022
399.8

 
3.90

 
399.7

 
3.90

4.50% Senior Notes, net of discount of $1.4 million and $1.5 million as of December 31, 2016 and 2015, respectively, due November 2023
698.6

 
4.50

 
698.5

 
4.50

3.65% Senior Notes, net of discount of $0.9 million and $1.0 million as of December 31, 2016 and 2015, due September 2024
399.1

 
3.65

 
399.0

 
3.65

Total
2,658.2

 
3.54

 
2,309.2

 
3.67

Less current portion
25.8

 
2.11

 
6.5

 
2.05

Less unamortized debt issuance costs
12.4

 
 
 
12.3

 
 
Total long-term debt
$
2,620.0

 
3.57
%
 
$
2,290.4

 
3.69
%