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Debt (Tables)
 3 Months Ended
Mar. 31, 2018
Debt [Abstract]  
Available and Unused Credit Lines
Available and unused credit lines at March 31, 2018 and December 31, 2017 were (in millions):
 
2018
 
2017
Credit Facility
$
2,500.0

 
$
2,500.0

Uncommitted credit lines
1,207.4

 
1,181.0

Available and unused credit lines
$
3,707.4

 
$
3,681.0
Long-Term Debt
Long-term debt at March 31, 2018 and December 31, 2017 was (in millions):
 
2018
 
2017
6.25% Senior Notes due 2019
$
500.0

 
$
500.0

4.45% Senior Notes due 2020
1,000.0

 
1,000.0

3.625% Senior Notes due 2022
1,250.0

 
1,250.0

3.65% Senior Notes due 2024
750.0

 
750.0

3.60% Senior Notes due 2026
1,400.0

 
1,400.0

 
4,900.0

 
4,900.0

Unamortized premium (discount), net
5.9

 
6.2

Unamortized debt issuance costs
(19.3
)
 
(20.3
)
Unamortized deferred gain from settlement of interest rate swaps
61.8

 
66.4

Fair value adjustment attributed to outstanding interest rate swaps
(63.4
)
 
(39.4
)
 
4,885.0

 
4,912.9

Current portion
—

 
—

Long-term debt
$
4,885.0

 
$
4,912.9