Consolidated Balance Sheets (Parenthetical) $ in Millions	Sep. 30, 2017 € / shares	Sep. 30, 2017 USD ($) $ / shares shares	Dec. 31, 2016 € / shares	Dec. 31, 2016 USD ($) $ / shares shares
Stockholders' Equity:
Preferred shares, par value | $ / shares		$ 0.0001		$ 0.0001
Preferred shares, authorized		10,000,000		10,000,000
Ordinary shares, par value | € / shares	€ 0.001		€ 0.001
Ordinary shares, authorized		10,000,000,000		10,000,000,000
Ordinary shares outstanding		140,800,000		143,400,000
Allowance for doubtful accounts | $		$ 6.2		$ 6.3
Commitments and contingencies | $		$ 0.0		$ 0.0