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Debt - Investment Grade Rating Schedule (Details)		12 Months Ended
Debt - Investment Grade Rating Schedule (Details)	Sep. 30, 2016	Dec. 31, 2016
Credit rating at least A- or A3 \| Adjusted LIBOR Rate Loans and Letter of Credit \| LIBOR
Debt
Reference rate (as a percent)	0.85%
Credit rating at least A- or A3 \| Adjusted LIBOR Rate Term Loans and Letter Of Credit \| LIBOR
Debt
Reference rate (as a percent)	1.40%
Credit rating at least BBBplus or BAA1 \| Adjusted LIBOR Rate Loans and Letter of Credit \| LIBOR
Debt
Reference rate (as a percent)	0.90%
Credit rating at least BBBplus or BAA1 \| Adjusted LIBOR Rate Term Loans and Letter Of Credit \| LIBOR
Debt
Reference rate (as a percent)	1.45%
Credit rating at least BBB or BAA2 \| Adjusted LIBOR Rate Loans and Letter of Credit \| LIBOR
Debt
Reference rate (as a percent)	1.00%
Credit rating at least BBB or BAA2 \| Adjusted LIBOR Rate Term Loans and Letter Of Credit \| LIBOR
Debt
Reference rate (as a percent)	1.55%
Credit rating at least BBB- or BAA3 \| Adjusted LIBOR Rate Loans and Letter of Credit \| LIBOR
Debt
Reference rate (as a percent)	1.20%
Credit rating at least BBB- or BAA3 \| Adjusted LIBOR Rate Term Loans and Letter Of Credit \| LIBOR
Debt
Reference rate (as a percent)	1.80%
Credit rating below BBB- or BAA3 \| Adjusted LIBOR Rate Loans and Letter of Credit \| LIBOR
Debt
Reference rate (as a percent)	1.55%
Credit rating below BBB- or BAA3 \| Adjusted LIBOR Rate Term Loans and Letter Of Credit \| LIBOR
Debt
Reference rate (as a percent)	2.25%
Credit Agreement \| Credit rating at least A- or A3 \| Base Rate Loans \| Base Rate
Debt
Reference rate (as a percent)		0.00%
Credit Agreement \| Credit rating at least BBBplus or BAA1 \| Base Rate Loans \| Base Rate
Debt
Reference rate (as a percent)		0.00%
Credit Agreement \| Credit rating at least BBB or BAA2 \| Base Rate Loans \| Base Rate
Debt
Reference rate (as a percent)		0.10%
Credit Agreement \| Credit rating at least BBB- or BAA3 \| Base Rate Loans \| Base Rate
Debt
Reference rate (as a percent)		0.20%
Credit Agreement \| Credit rating below BBB- or BAA3 \| Base Rate Loans \| Base Rate
Debt
Reference rate (as a percent)		0.60%
Term Loan \| Credit rating at least A- or A3 \| Base Rate Loans \| Base Rate
Debt
Reference rate (as a percent)		0.40%
Term Loan \| Credit rating at least BBBplus or BAA1 \| Base Rate Loans \| Base Rate
Debt
Reference rate (as a percent)		0.45%
Term Loan \| Credit rating at least BBB or BAA2 \| Base Rate Loans \| Base Rate
Debt
Reference rate (as a percent)		0.55%
Term Loan \| Credit rating at least BBB- or BAA3 \| Base Rate Loans \| Base Rate
Debt
Reference rate (as a percent)		0.80%
Term Loan \| Credit rating below BBB- or BAA3 \| Base Rate Loans \| Base Rate
Debt
Reference rate (as a percent)		1.25%