Debt - Schedule of Debt and Capital Lease Obligations (Parenthetical) (Details)	1 Months Ended		3 Months Ended
	Feb. 28, 2017	Aug. 31, 2015	Mar. 31, 2017
4.7% senior unsecured notes due 2025
Debt Instrument [Line Items]
Debt instrument, interest rate		4.70%	4.70%
Debt instrument, maturity year		2025	2025
Senior unsecured credit facility- revolving loan due 2021
Debt Instrument [Line Items]
Debt instrument, maturity year			2021
3.95% senior unsecured notes due 2027
Debt Instrument [Line Items]
Debt instrument, interest rate	3.95%
Debt instrument, maturity year	2027		2027