Annual report pursuant to Section 13 and 15(d)

Long-Term Debt and Borrowing Arrangements (Schedule of Available Capacity Under Borrowing Arrangements) (Details)

v3.10.0.1
Long-Term Debt and Borrowing Arrangements (Schedule of Available Capacity Under Borrowing Arrangements) (Details) - $750 million revolving credit facility (due May 2023) - USD ($)
Dec. 31, 2018
May 31, 2018
Debt Instrument [Line Items]    
Total capacity $ 750,000,000 $ 750,000,000
Less: Letters of credit 15,000,000  
Available capacity $ 735,000,000