Subsequent Events (Narrative) (Details) - Credit Facility [Member] - USD ($)	Feb. 22, 2017	Dec. 31, 2016
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity		$ 1,240,000,000
Term Loan [Member]
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity		238,000,000
Maximum [Member]
Subsequent Event [Line Items]
Line of credit facility, revolving loans sublimit, Canadian dollars or Mexican pesos		$ 200,000,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,500,000,000
Subsequent Event [Member] | Term Loan [Member]
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity	400,000,000
Line of credit facility, principal amount currently drawn	250,000,000
Line of credit facility, remaining borrowing capacity	150,000,000
Subsequent Event [Member] | Maximum [Member]
Subsequent Event [Line Items]
Line of credit facility, revolving loans sublimit, Canadian dollars or Mexican pesos	$ 300,000,000