Debt - Long Term Debt Outstanding (Details)	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 USD ($)	Sep. 30, 2016	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 USD ($)	Jun. 30, 2015 EUR (€)
Debt Instrument [Line Items]
Long-term debt		$ 3,159,336,000			$ 3,183,140,000
7.456% Senior Notes Due 2018
Debt Instrument [Line Items]
Long-term debt		$ 500,000,000			$ 500,000,000
Senior notes, interest rate	7.456%	7.456%		7.456%	7.456%
Senior unsecured notes principal amount		$ 500,000,000
5.95% Senior Notes Due 2020
Debt Instrument [Line Items]
Long-term debt		$ 747,020,000			$ 746,216,000
Senior notes, interest rate	5.95%	5.95%	5.95%	5.95%	5.95%
Senior unsecured notes principal amount		$ 750,000,000
2.5% Senior Notes Due 2022
Debt Instrument [Line Items]
Long-term debt		$ 677,503,000			$ 703,254,000
Senior notes, interest rate	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Senior unsecured notes principal amount | €	€ 650,000,000			€ 650,000,000		€ 650,000,000
4.5% Senior Notes Due 2024
Debt Instrument [Line Items]
Long-term debt		$ 494,472,000			$ 493,797,000
Senior notes, interest rate	4.50%	4.50%	4.50%	4.50%	4.50%
Senior unsecured notes principal amount		$ 500,000,000
5.0% Senior Notes Due 2026
Debt Instrument [Line Items]
Long-term debt		$ 740,341,000			$ 739,873,000
Senior notes, interest rate	5.00%	5.00%	5.00%	5.00%	5.00%
Senior unsecured notes principal amount		$ 750,000,000