Shareholders' Equity - Accumulated Other Comprehensive Income (Details) $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($)
Summary of the components of accumulated other comprehensive income (loss), net of tax
Balance at beginning of period	$ (75.9)
Balance at end of period	(13.0)
Accumulated Other Comprehensive Income (Loss)
Summary of the components of accumulated other comprehensive income (loss), net of tax
Balance at beginning of period	(75.9)
Other comprehensive income (loss) before reclassifications	66.3
Amounts reclassified from other comprehensive income (loss), net of tax of $0.2 million	(3.4)
Net current period other comprehensive income	62.9
Balance at end of period	(13.0)
Amount from reclassification, tax	0.2
Foreign Currency Translation
Summary of the components of accumulated other comprehensive income (loss), net of tax
Balance at beginning of period	(24.1)
Other comprehensive income (loss) before reclassifications	64.6
Net current period other comprehensive income	64.6
Balance at end of period	40.5
Pension Liability Adjustment
Summary of the components of accumulated other comprehensive income (loss), net of tax
Balance at beginning of period	(51.8)
Other comprehensive income (loss) before reclassifications	1.7
Amounts reclassified from other comprehensive income (loss), net of tax of $0.2 million	(3.4)
Net current period other comprehensive income	(1.7)
Balance at end of period	(53.5)
Amount from reclassification, tax	$ 0.2