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Senior Notes (Tables)
 12 Months Ended
Dec. 31, 2016
Debt Disclosure [Abstract]  
Summary of Principal Terms of Senior Notes
 
 
2024
Senior
Notes
 
2025
Senior
Notes
 
2042
Senior
Notes
Issue date
 
February 2014

 
February 2015

 
August 2012

Maturity date
 
February 2024

 
August 2025

 
August 2042

Potential Call Date
 
Any Time (1)

 
Any Time (1)

 
August 2017

Par value (in millions)
 
$
400.0

 
$
350.0

 
$
200.0

Call Price
 
As Defined (1)

 
As Defined (1)

 
At Par

Stated coupon
 
4.25
%
 
3.50
%
 
6.375
%
Coupon frequency
 
Semi-annually

 
Semi-annually

 
Quarterly

__________________________

(1) 
The 2024 and 2025 senior notes may be redeemed at any time, in whole or in part, at a make-whole redemption price plus accrued and unpaid interest.